diff --git a/processor/src/main/java/org/mapstruct/ap/model/common/TypeFactory.java b/processor/src/main/java/org/mapstruct/ap/model/common/TypeFactory.java
index 73e6b557d..1721f978e 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/common/TypeFactory.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/common/TypeFactory.java
@@ -51,6 +51,7 @@ import javax.lang.model.util.Types;
 import org.mapstruct.ap.prism.MappingTargetPrism;
 import org.mapstruct.ap.prism.TargetTypePrism;
 import org.mapstruct.ap.util.AnnotationProcessingException;
+import org.mapstruct.ap.util.TypeUtilsJDK6Fix;
 
 /**
  * Factory creating {@link Type} instances.
@@ -122,18 +123,9 @@ public class TypeFactory {
 
         Type implementationType = getImplementationType( mirror );
 
-        boolean isIterableType = typeUtils.isSubtype(
-            typeUtils.erasure( mirror ),
-            typeUtils.erasure( iterableType )
-        );
-        boolean isCollectionType = typeUtils.isSubtype(
-            typeUtils.erasure( mirror ),
-            typeUtils.erasure( collectionType )
-        );
-        boolean isMapType = typeUtils.isSubtype(
-            typeUtils.erasure( mirror ),
-            typeUtils.erasure( mapType )
-        );
+        boolean isIterableType = TypeUtilsJDK6Fix.isSubType( typeUtils, mirror, iterableType );
+        boolean isCollectionType = TypeUtilsJDK6Fix.isSubType( typeUtils, mirror, collectionType );
+        boolean isMapType = TypeUtilsJDK6Fix.isSubType( typeUtils, mirror, mapType );
 
         boolean isEnumType;
         boolean isInterface;
diff --git a/processor/src/main/java/org/mapstruct/ap/model/source/MethodMatcher.java b/processor/src/main/java/org/mapstruct/ap/model/source/MethodMatcher.java
index 51adbd9b5..24e685e26 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/source/MethodMatcher.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/source/MethodMatcher.java
@@ -36,6 +36,7 @@ import javax.lang.model.util.SimpleTypeVisitor6;
 import javax.lang.model.util.Types;
 
 import org.mapstruct.ap.model.common.Type;
+import org.mapstruct.ap.util.TypeUtilsJDK6Fix;
 
 /**
  * SourceMethodMatcher $8.4 of the JavaLanguage specification describes a method body as such:
@@ -207,8 +208,8 @@ public class MethodMatcher {
             }
             else {
                 // check if types are in bound
-                if ( typeUtils.isSubtype( typeUtils.erasure( t.getLowerBound() ), typeUtils.erasure( p ) ) &&
-                        typeUtils.isSubtype( typeUtils.erasure( p ), typeUtils.erasure( t.getUpperBound() ) ) ) {
+                if ( TypeUtilsJDK6Fix.isSubType( typeUtils, t.getLowerBound(), p) &&
+                        TypeUtilsJDK6Fix.isSubType( typeUtils, p, t.getUpperBound() ) ) {
                     genericTypesMap.put( t, p );
                     return Boolean.TRUE;
                 }
@@ -228,7 +229,7 @@ public class MethodMatcher {
                     case DECLARED:
                         // for example method: String method(? extends String)
                         // isSubType checks range [subtype, type], e.g. isSubtype [Object, String]==true
-                        return typeUtils.isSubtype( typeUtils.erasure( p ), extendsBound );
+                        return TypeUtilsJDK6Fix.isSubType( typeUtils, p, extendsBound );
 
                     case TYPEVAR:
                         // for example method: <T extends String & Serializable> T method(? extends T)
@@ -250,8 +251,8 @@ public class MethodMatcher {
                         // for example method: String method(? super String)
                         // to check super type, we can simply reverse the argument, but that would initially yield
                         // a result: <type, superType] (so type not included) so we need to check sameType also.
-                        return ( typeUtils.isSubtype( typeUtils.erasure( superBound ), p ) ||
-                                typeUtils.isSameType( p, superBound ) );
+                        return TypeUtilsJDK6Fix.isSubType( typeUtils, superBound , p ) ||
+                                typeUtils.isSameType( p, superBound );
 
                     case TYPEVAR:
 
@@ -269,9 +270,8 @@ public class MethodMatcher {
                         // to check super type, we can simply reverse the argument, but that would initially yield
                         // a result: <type, superType] (so type not included) so we need to check sameType also.
                         TypeMirror superBoundAsDeclared = typeParameter.getBounds().get( 0 );
-                        return (  typeUtils.isSubtype( typeUtils.erasure( superBoundAsDeclared ),
-                                                       typeUtils.erasure( p ) ) ||
-                                  typeUtils.isSameType( p, superBoundAsDeclared ) );
+                        return ( TypeUtilsJDK6Fix.isSubType(  typeUtils, superBoundAsDeclared,  p )  ||
+                                 typeUtils.isSameType( p, superBoundAsDeclared ) );
                     default:
                         // does this situation occur?
                         return Boolean.FALSE;
@@ -311,7 +311,7 @@ public class MethodMatcher {
         if ( t != null && bounds != null ) {
             for ( TypeMirror bound : bounds ) {
                 if ( !( bound.getKind().equals( TypeKind.DECLARED ) &&
-                        typeUtils.isSubtype( typeUtils.erasure( t ), typeUtils.erasure( bound ) ) ) ) {
+                        TypeUtilsJDK6Fix.isSubType( typeUtils, t,  bound ) ) ) {
                     return false;
                 }
             }
diff --git a/processor/src/main/java/org/mapstruct/ap/util/TypeUtilsJDK6Fix.java b/processor/src/main/java/org/mapstruct/ap/util/TypeUtilsJDK6Fix.java
new file mode 100644
index 000000000..15280119d
--- /dev/null
+++ b/processor/src/main/java/org/mapstruct/ap/util/TypeUtilsJDK6Fix.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.util;
+
+import javax.lang.model.type.TypeMirror;
+import javax.lang.model.util.Types;
+
+/**
+ *
+ * @author Sjaak Derksen
+ */
+public class TypeUtilsJDK6Fix {
+
+    private TypeUtilsJDK6Fix() { }
+
+    /**
+     * Tests whether one type is a subtype of another.
+     * Any type is considered to be a subtype of itself.
+     *
+     * @param types the type utils
+     * @param t1  the first type
+     * @param t2  the second type
+     * @return {@code true} if and only if the first type is a subtype
+     *          of the second
+     * @throws IllegalArgumentException if given an executable or package type
+     * @jls 4.10 Subtyping
+     */
+    public static boolean isSubType(Types types, TypeMirror t1, TypeMirror t2) {
+        return types.isSubtype( types.erasure( t1 ), types.erasure( t2 ) );
+    }
+}