diff --git a/include/wx/hashmap.h b/include/wx/hashmap.h
index 52c71a1abb..238dd9a7d7 100644
--- a/include/wx/hashmap.h
+++ b/include/wx/hashmap.h
@@ -660,8 +660,6 @@ public: \
         Node *node = GetOrCreateNode( \
                 CLASSNAME##_wxImplementation_Pair( v.first, v.second ), \
                 created); \
-        if ( !created ) \
-            node->m_value.second = v.second; \
         return Insert_Result(iterator(node, this), created); \
     } \
  \