diff --git a/Source/JavaScriptCore/runtime/Structure.h b/Source/JavaScriptCore/runtime/Structure.h
index e3a25bb..57368be 100644
--- a/Source/JavaScriptCore/runtime/Structure.h
+++ b/Source/JavaScriptCore/runtime/Structure.h
@@ -36,12 +36,12 @@
 #include "Protect.h"
 #include "StructureTransitionTable.h"
 #include "JSTypeInfo.h"
-#include "UString.h"
 #include "Watchpoint.h"
 #include "Weak.h"
 #include <wtf/PassOwnPtr.h>
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
+#include <wtf/text/StringImpl.h>
 
 
 namespace JSC {
@@ -259,7 +259,7 @@
         bool masqueradesAsUndefined(JSGlobalObject* lexicalGlobalObject);
 
         PropertyOffset get(JSGlobalData&, PropertyName);
-        PropertyOffset get(JSGlobalData&, const UString& name);
+        PropertyOffset get(JSGlobalData&, const WTF::String& name);
         JS_EXPORT_PRIVATE PropertyOffset get(JSGlobalData&, PropertyName, unsigned& attributes, JSCell*& specificValue);
 
         bool hasGetterSetterProperties() const { return m_hasGetterSetterProperties; }
@@ -501,7 +501,7 @@
         return entry ? entry->offset : invalidOffset;
     }
 
-    inline PropertyOffset Structure::get(JSGlobalData& globalData, const UString& name)
+    inline PropertyOffset Structure::get(JSGlobalData& globalData, const WTF::String& name)
     {
         ASSERT(structure()->classInfo() == &s_info);
         materializePropertyMapIfNecessary(globalData);