diff --git a/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.cpp b/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.cpp
index 910a82bb7ef..d34f4b26c5e 100644
--- a/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.cpp
+++ b/mozilla/extensions/java/xpcom/src/nsJavaXPCOMBindingUtils.cpp
@@ -741,6 +741,8 @@ JavaXPCOMInstance::JavaXPCOMInstance(nsISupports* aInstance,
 
 JavaXPCOMInstance::~JavaXPCOMInstance()
 {
+  nsresult rv = NS_OK;
+
   // Need to release these objects on the main thread.
   nsCOMPtr<nsIThread> thread = do_GetMainThread();
   if (thread) {