diff --git a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
index bb95caf..cd9de22 100644
--- a/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
+++ b/Source/JavaScriptCore/bytecompiler/NodesCodegen.cpp
@@ -256,9 +256,9 @@
                 continue;
 
             GetterSetterPair pair(node, static_cast<PropertyNode*>(0));
-            std::pair<GetterSetterMap::iterator, bool> result = map.add(node->name().impl(), pair);
-            if (!result.second)
-                result.first->second.second = node;
+            GetterSetterMap::AddResult result = map.add(node->name().impl(), pair);
+            if (!result.isNewEntry)
+                result.iterator->second.second = node;
         }
 
         // Iterate over the remaining properties in the list.