diff --git a/jdk/src/share/classes/com/sun/tools/jdi/ReferenceTypeImpl.java b/jdk/src/share/classes/com/sun/tools/jdi/ReferenceTypeImpl.java
index ab76a876e6d..88af45d9c96 100644
--- a/jdk/src/share/classes/com/sun/tools/jdi/ReferenceTypeImpl.java
+++ b/jdk/src/share/classes/com/sun/tools/jdi/ReferenceTypeImpl.java
@@ -529,7 +529,7 @@ implements ReferenceType {
          * to filter that ordered collection.
          */
         List<Method> list = allMethods();
-        list.retainAll(map.values());
+        list.retainAll(new HashSet<Method>(map.values()));
         return list;
     }