diff --git a/content/xul/document/src/nsXULDocument.cpp b/content/xul/document/src/nsXULDocument.cpp
index a1e8aad52e29..1273ad4d9303 100644
--- a/content/xul/document/src/nsXULDocument.cpp
+++ b/content/xul/document/src/nsXULDocument.cpp
@@ -3623,7 +3623,7 @@ nsXULDocument::OnStreamComplete(nsIStreamLoader* aLoader,
 
 
 nsresult
-nsXULDocument::ExecuteScript(nsIScriptContext * aContext, void * aScriptObject)
+nsXULDocument::ExecuteScript(nsIScriptContext * aContext, JSScript* aScriptObject)
 {
     NS_PRECONDITION(aScriptObject != nsnull && aContext != nsnull, "null ptr");
     if (! aScriptObject || ! aContext)
diff --git a/content/xul/document/src/nsXULDocument.h b/content/xul/document/src/nsXULDocument.h
index cbfe2e447d8e..dd83f06895f3 100644
--- a/content/xul/document/src/nsXULDocument.h
+++ b/content/xul/document/src/nsXULDocument.h
@@ -396,7 +396,7 @@ protected:
      * Execute the precompiled script object scoped by this XUL document's
      * containing window object, and using its associated script context.
      */
-    nsresult ExecuteScript(nsIScriptContext *aContext, void* aScriptObject);
+    nsresult ExecuteScript(nsIScriptContext *aContext, JSScript* aScriptObject);
 
     /**
      * Helper method for the above that uses aScript to find the appropriate