1 files changed, 5 insertions, 1 deletions
diff --git a/WebCore/bindings/js/ScriptString.h b/WebCore/bindings/js/ScriptString.h
index 6dab9a0..a33d639 100644
--- a/WebCore/bindings/js/ScriptString.h
+++ b/WebCore/bindings/js/ScriptString.h
@@ -33,6 +33,7 @@
 
 #include "PlatformString.h"
 #include <runtime/UString.h>
+#include <runtime/StringBuilder.h>
 
 namespace WebCore {
 
@@ -57,7 +58,10 @@ public:
 
     ScriptString& operator+=(const String& s)
     {
-        m_str += s;
+        JSC::StringBuilder buffer;
+        buffer.append(m_str);
+        buffer.append(s);
+        m_str = buffer.release();
         return *this;
     }