diff --git a/core/src/main/java/org/mapstruct/BeanMapping.java b/core/src/main/java/org/mapstruct/BeanMapping.java
index f8c749fbd..3359cd891 100644
--- a/core/src/main/java/org/mapstruct/BeanMapping.java
+++ b/core/src/main/java/org/mapstruct/BeanMapping.java
@@ -118,7 +118,7 @@ public @interface BeanMapping {
 
     /**
      * Default ignore all mappings. All mappings have to be defined manually. No automatic mapping will take place. No
-     * warning will be issued on missing target properties.
+     * warning will be issued on missing source or target properties.
      *
      * @return The ignore strategy (default false).
      *
diff --git a/processor/src/main/java/org/mapstruct/ap/internal/model/BeanMappingMethod.java b/processor/src/main/java/org/mapstruct/ap/internal/model/BeanMappingMethod.java
index 36dae0ba5..17bf2cb46 100644
--- a/processor/src/main/java/org/mapstruct/ap/internal/model/BeanMappingMethod.java
+++ b/processor/src/main/java/org/mapstruct/ap/internal/model/BeanMappingMethod.java
@@ -1514,6 +1514,10 @@ public class BeanMappingMethod extends NormalTypeMappingMethod {
             if ( mappingReferences.isForForgedMethods() ) {
                 return ReportingPolicyGem.IGNORE;
             }
+            // If we have ignoreByDefault = true, unprocessed source properties are not an issue.
+            if ( method.getOptions().getBeanMapping().isignoreByDefault() ) {
+                return ReportingPolicyGem.IGNORE;
+            }
             return method.getOptions().getMapper().unmappedSourcePolicy();
         }
 
diff --git a/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/ErroneousSourceTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/ErroneousSourceTargetMapper.java
new file mode 100644
index 000000000..4ec3c6450
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/ErroneousSourceTargetMapper.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.ignorebydefaultsource;
+
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.ReportingPolicy;
+import org.mapstruct.factory.Mappers;
+
+@Mapper(
+    unmappedTargetPolicy = ReportingPolicy.IGNORE,
+    unmappedSourcePolicy = ReportingPolicy.ERROR)
+public interface ErroneousSourceTargetMapper {
+    ErroneousSourceTargetMapper INSTANCE = Mappers.getMapper( ErroneousSourceTargetMapper.class );
+
+    @Mapping(source = "one", target = "one")
+    Target sourceToTarget(Source source);
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/IgnoreByDefaultSourcesTest.java b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/IgnoreByDefaultSourcesTest.java
new file mode 100644
index 000000000..98f2cde4c
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/IgnoreByDefaultSourcesTest.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.ignorebydefaultsource;
+
+import javax.tools.Diagnostic.Kind;
+
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+import org.mapstruct.ap.testutil.compilation.annotation.CompilationResult;
+import org.mapstruct.ap.testutil.compilation.annotation.Diagnostic;
+import org.mapstruct.ap.testutil.compilation.annotation.ExpectedCompilationOutcome;
+
+@IssueKey("2560")
+public class IgnoreByDefaultSourcesTest {
+
+    @ProcessorTest
+    @WithClasses({ SourceTargetMapper.class, Source.class, Target.class })
+    public void shouldSucceed() {
+    }
+
+    @ProcessorTest
+    @WithClasses({ ErroneousSourceTargetMapper.class, Source.class, Target.class })
+    @ExpectedCompilationOutcome(
+        value = CompilationResult.FAILED,
+        diagnostics = {
+            @Diagnostic(type = ErroneousSourceTargetMapper.class,
+                kind = Kind.ERROR,
+                line = 20,
+                message = "Unmapped source property: \"other\".")
+        }
+    )
+    public void shouldRaiseErrorDueToNonIgnoredSourceProperty() {
+    }
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Source.java b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Source.java
new file mode 100644
index 000000000..81d6441d5
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Source.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.ignorebydefaultsource;
+
+class Source {
+    private int one;
+    private int other;
+
+    public int getOne() {
+        return one;
+    }
+
+    public void setOne(int one) {
+        this.one = one;
+    }
+
+    public int getOther() {
+        return other;
+    }
+
+    public void setOther(int other) {
+        this.other = other;
+    }
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/SourceTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/SourceTargetMapper.java
new file mode 100644
index 000000000..e029bd739
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/SourceTargetMapper.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.ignorebydefaultsource;
+
+import org.mapstruct.BeanMapping;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.ReportingPolicy;
+import org.mapstruct.factory.Mappers;
+
+@Mapper(
+    unmappedTargetPolicy = ReportingPolicy.IGNORE,
+    unmappedSourcePolicy = ReportingPolicy.ERROR)
+public interface SourceTargetMapper {
+    SourceTargetMapper INSTANCE = Mappers.getMapper( SourceTargetMapper.class );
+
+    @Mapping(source = "one", target = "one")
+    @BeanMapping(ignoreByDefault = true)
+    Target sourceToTarget(Source source);
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Target.java b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Target.java
new file mode 100644
index 000000000..68ec5c893
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/ignorebydefaultsource/Target.java
@@ -0,0 +1,18 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.ignorebydefaultsource;
+
+class Target {
+    private int one;
+
+    public int getOne() {
+        return one;
+    }
+
+    public void setOne(int one) {
+        this.one = one;
+    }
+}