--- a/dom/base/nsJSTimeoutHandler.cpp
+++ b/dom/base/nsJSTimeoutHandler.cpp
@@ -56,17 +56,16 @@ public:
 private:
 
   nsCOMPtr<nsIScriptContext> mContext;
 
   // filename, line number and JS language version string of the
   // caller of setTimeout()
   nsCString mFileName;
   PRUint32 mLineNo;
-  PRUint32 mVersion;
   nsCOMPtr<nsIJSArgArray> mArgv;
 
   // The JS expression to evaluate or function to call, if !mExpr
   JSFlatString *mExpr;
   JSObject *mFunObj;
 };
 
 
@@ -124,17 +123,16 @@ NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(
   NS_INTERFACE_MAP_ENTRY(nsISupports)
 NS_INTERFACE_MAP_END
 
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSScriptTimeoutHandler)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSScriptTimeoutHandler)
 
 nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler() :
   mLineNo(0),
-  mVersion(nsnull),
   mExpr(nsnull),
   mFunObj(nsnull)
 {
 }
 
 nsJSScriptTimeoutHandler::~nsJSScriptTimeoutHandler()
 {
   ReleaseJSObjects();