diff --git a/content/xul/content/src/nsXULElement.cpp b/content/xul/content/src/nsXULElement.cpp
index d7e97f850640..0c08642f62f0 100644
--- a/content/xul/content/src/nsXULElement.cpp
+++ b/content/xul/content/src/nsXULElement.cpp
@@ -146,6 +146,7 @@
 
 #include "nsISizeOfHandler.h"
 #include "nsReadableUtils.h"
+#include "nsITimelineService.h"
 
 class nsIWebShell;
 
@@ -4965,6 +4966,7 @@ nsresult
 nsXULPrototypeScript::Deserialize(nsIObjectInputStream* aStream,
                                   nsIScriptContext* aContext)
 {
+    NS_TIMELINE_MARK_FUNCTION("chrome js deserialize");
     nsresult rv;
 
     NS_ASSERTION(!mSrcLoading || mSrcLoadWaiters != nsnull || !mJSObject,