diff --git a/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java b/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java
index f5897c3c..ffd902d1 100644
--- a/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java
+++ b/src/main/java/org/apache/maven/plugins/shade/DefaultShader.java
@@ -256,6 +256,10 @@ else if ( shadeRequest.isShadeSourcesContent() && name.endsWith( ".java" ) )
 
                     addResource( resources, jos, mappedName, entry.getTime(), in );
                 }
+                else
+                {
+                    duplicates.remove( name, jar );
+                }
             }
         }
     }