diff --git a/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java b/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java
index 0688178ce..aa81ff20d 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java
@@ -27,7 +27,6 @@ import org.mapstruct.ap.model.assignment.Assignment;
 import org.mapstruct.ap.model.assignment.SetterWrapper;
 import org.mapstruct.ap.model.common.Parameter;
 import org.mapstruct.ap.model.common.Type;
-import org.mapstruct.ap.model.common.TypeFactory;
 import org.mapstruct.ap.model.source.Method;
 import org.mapstruct.ap.prism.NullValueMappingPrism;
 import org.mapstruct.ap.util.MapperConfig;
@@ -45,7 +44,7 @@ public class IterableMappingMethod extends MappingMethod {
     private final MethodReference factoryMethod;
     private final boolean overridden;
     private final boolean mapNullToDefault;
-    private final TypeFactory typeFactory;
+    private final String loopVariableName;
 
     public static class Builder {
 
@@ -79,7 +78,7 @@ public class IterableMappingMethod extends MappingMethod {
                 method.getSourceParameters().iterator().next().getType().getTypeParameters().get( 0 );
             Type targetElementType =
                 method.getResultType().getTypeParameters().get( 0 );
-            String conversionStr =
+            String loopVariableName =
                 Strings.getSaveVariableName( sourceElementType.getName(), method.getParameterNames() );
 
 
@@ -91,7 +90,7 @@ public class IterableMappingMethod extends MappingMethod {
                 null, // there is no targetPropertyName
                 dateFormat,
                 qualifiers,
-                conversionStr
+                loopVariableName
             );
 
             if ( assignment == null ) {
@@ -117,20 +116,20 @@ public class IterableMappingMethod extends MappingMethod {
                 assignment,
                 factoryMethod,
                 mapNullToDefault,
-                ctx.getTypeFactory()
+                loopVariableName
             );
         }
     }
 
 
     private IterableMappingMethod(Method method, Assignment parameterAssignment, MethodReference factoryMethod,
-                                  boolean mapNullToDefault, TypeFactory typeFactory) {
+                                  boolean mapNullToDefault, String loopVariableName ) {
         super( method );
         this.elementAssignment = parameterAssignment;
         this.factoryMethod = factoryMethod;
         this.overridden = method.overridesMethod();
         this.mapNullToDefault = mapNullToDefault;
-        this.typeFactory = typeFactory;
+        this.loopVariableName = loopVariableName;
     }
 
     public Parameter getSourceParameter() {
@@ -167,10 +166,7 @@ public class IterableMappingMethod extends MappingMethod {
     }
 
     public String getLoopVariableName() {
-        return Strings.getSaveVariableName(
-            getSourceParameter().getType().getTypeParameters().get( 0 ).getName(),
-            getParameterNames()
-        );
+        return loopVariableName;
     }
 
     public MethodReference getFactoryMethod() {
diff --git a/processor/src/main/java/org/mapstruct/ap/model/source/ForgedMethod.java b/processor/src/main/java/org/mapstruct/ap/model/source/ForgedMethod.java
index 12b1ccdb2..3729a4ae2 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/source/ForgedMethod.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/source/ForgedMethod.java
@@ -18,6 +18,7 @@
  */
 package org.mapstruct.ap.model.source;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -50,7 +51,9 @@ public class ForgedMethod implements Method {
      * @param positionHintElement element used to for reference to the position in the source file.
      */
     public ForgedMethod(Type sourceType, Type targetType, ExecutableElement positionHintElement) {
-        this.parameters = Arrays.asList( new Parameter( Strings.decapitalize( sourceType.getName() ), sourceType ) );
+        String sourceParamName = Strings.decapitalize( sourceType.getName() );
+        String sourceParamSafeName = Strings.getSaveVariableName( sourceParamName );
+        this.parameters = Arrays.asList( new Parameter( sourceParamSafeName, sourceType ) );
         this.returnType = targetType;
 
         String fromName = getName( parameters.iterator().next().getType() );
@@ -69,7 +72,9 @@ public class ForgedMethod implements Method {
      * @param positionHintElement element used to for reference to the position in the source file.
      */
     public ForgedMethod(String name, Type sourceType, Type targetType, ExecutableElement positionHintElement) {
-        this.parameters = Arrays.asList( new Parameter( Strings.decapitalize( sourceType.getName() ), sourceType ) );
+        String sourceParamName = Strings.decapitalize( sourceType.getName() );
+        String sourceParamSafeName = Strings.getSaveVariableName( sourceParamName );
+        this.parameters = Arrays.asList( new Parameter( sourceParamSafeName, sourceType ) );
         this.returnType = targetType;
         this.name = name;
         this.positionHintElement = positionHintElement;
@@ -150,7 +155,11 @@ public class ForgedMethod implements Method {
 
     @Override
     public List<String> getParameterNames() {
-        return Arrays.asList( "source" );
+        List<String> parameterNames = new ArrayList<String>();
+        for ( Parameter parameter : getParameters() ) {
+            parameterNames.add( parameter.getName() );
+        }
+        return parameterNames;
     }
 
     @Override
diff --git a/processor/src/main/resources/org.mapstruct.ap.model.MapMappingMethod.ftl b/processor/src/main/resources/org.mapstruct.ap.model.MapMappingMethod.ftl
index 4aa59ff5a..478b5509c 100644
--- a/processor/src/main/resources/org.mapstruct.ap.model.MapMappingMethod.ftl
+++ b/processor/src/main/resources/org.mapstruct.ap.model.MapMappingMethod.ftl
@@ -39,13 +39,11 @@
     <#-- key -->
         <@includeModel object=keyAssignment
                    targetAccessorName=keyVariableName
-                   targetType=resultType.typeParameters[0]
-                   isLocalVar=true/>
+                   targetType=resultType.typeParameters[0]/>
     <#-- value -->
         <@includeModel object=valueAssignment
                    targetAccessorName=valueVariableName
-                   targetType=resultType.typeParameters[1]
-                   isLocalVar=true/>
+                   targetType=resultType.typeParameters[1]/>
         ${resultName}.put( ${keyVariableName}, ${valueVariableName} );
     }
     <#if returnType.name != "void">
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Case.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Case.java
new file mode 100644
index 000000000..c4408429c
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Case.java
@@ -0,0 +1,27 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+import java.util.Map;
+
+/**
+ *
+ * @author Sjaak Derksen
+ */
+public interface Case<K, V> extends Map<K, V> { }
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Int.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Int.java
new file mode 100644
index 000000000..bf2f0c1ee
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Int.java
@@ -0,0 +1,29 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+import java.util.List;
+
+/**
+ *
+ * @author Sjaak Derksen
+ */
+public interface Int<E> extends List<E> {
+
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Mapper.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Mapper.java
new file mode 100644
index 000000000..6f48a4b16
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Mapper.java
@@ -0,0 +1,31 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+
+import org.mapstruct.Mapper;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface Issue375Mapper {
+
+    Issue375Mapper INSTANCE = Mappers.getMapper( Issue375Mapper.class );
+
+    Target mapTo(Source string);
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Test.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Test.java
new file mode 100644
index 000000000..bbcf16387
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Issue375Test.java
@@ -0,0 +1,40 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.runner.AnnotationProcessorTestRunner;
+
+/**
+ * Reproducer for https://github.com/mapstruct/mapstruct/issues/375.
+ *
+ * @author Sjaak Derksen
+ */
+@IssueKey( "375" )
+@RunWith(AnnotationProcessorTestRunner.class)
+public class Issue375Test {
+
+    @Test
+    @WithClasses( { Issue375Mapper.class, Source.class, Target.class, Int.class, Case.class } )
+    public void shouldForgeNewMappings() {
+    }
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Source.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Source.java
new file mode 100644
index 000000000..678e9a99d
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Source.java
@@ -0,0 +1,48 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+
+/**
+ *
+ * @author Sjaak Derksen
+ */
+public class Source {
+
+    private Int<String> testIterable;
+
+    private Case<String, Integer> testMap;
+
+    public Int<String> getTestIterable() {
+        return testIterable;
+    }
+
+    public void setTestIterable(Int<String> testIterable) {
+        this.testIterable = testIterable;
+    }
+
+    public Case<String, Integer> getTestMap() {
+        return testMap;
+    }
+
+    public void setTestMap(Case<String, Integer> testMap) {
+        this.testMap = testMap;
+    }
+
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Target.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Target.java
new file mode 100644
index 000000000..72866cb49
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_375/Target.java
@@ -0,0 +1,50 @@
+/**
+ *  Copyright 2012-2014 Gunnar Morling (http://www.gunnarmorling.de/)
+ *  and/or other contributors as indicated by the @authors tag. See the
+ *  copyright.txt file in the distribution for a full listing of all
+ *  contributors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.mapstruct.ap.test.bugs._375;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ *
+ * @author Sjaak Derksen
+ */
+public class Target {
+
+    private List<Integer> testIterable;
+
+    private Map<String, String> testMap;
+
+    public List<Integer> getTestIterable() {
+        return testIterable;
+    }
+
+    public void setTestIterable(List<Integer> testIterable) {
+        this.testIterable = testIterable;
+    }
+
+    public Map<String, String> getTestMap() {
+        return testMap;
+    }
+
+    public void setTestMap(Map<String, String> testMap) {
+        this.testMap = testMap;
+    }
+
+}