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 a45a64f99..d4a7bdb4f 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/IterableMappingMethod.java
@@ -177,7 +177,7 @@ public class IterableMappingMethod extends MappingMethod {
         if ( elementAssignment != null ) {
             types.addAll( elementAssignment.getImportTypes() );
         }
-        if ( factoryMethod == null ) {
+        if ( ( factoryMethod == null ) && ( !isExistingInstanceMapping() ) ) {
             types.addAll( getReturnType().getImportTypes() );
         }
         return types;
diff --git a/processor/src/main/java/org/mapstruct/ap/model/MapMappingMethod.java b/processor/src/main/java/org/mapstruct/ap/model/MapMappingMethod.java
index 3b2d7ec01..c4e8065bc 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/MapMappingMethod.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/MapMappingMethod.java
@@ -215,7 +215,7 @@ public class MapMappingMethod extends MappingMethod {
         if ( valueAssignment != null ) {
             types.addAll( valueAssignment.getImportTypes() );
         }
-        if ( factoryMethod == null ) {
+        if ( ( factoryMethod == null ) && ( !isExistingInstanceMapping() ) ) {
             types.addAll( getReturnType().getImportTypes() );
         }