diff --git a/mozilla/js/jsd/jsd_xpc.cpp b/mozilla/js/jsd/jsd_xpc.cpp
index a09c1da649c..ad42210af66 100644
--- a/mozilla/js/jsd/jsd_xpc.cpp
+++ b/mozilla/js/jsd/jsd_xpc.cpp
@@ -788,7 +788,7 @@ jsds_ScriptHookProc (JSDContext* jsdc, JSDScript* jsdscript, JSBool creating,
 
 /* Contexts */
 /*
-NS_IMPL_THREADSAFE_ISUPPORTS1(jsdContext, jsdIContext); 
+NS_IMPL_THREADSAFE_ISUPPORTS2(jsdContext, jsdIContext, jsdIEphemeral);
 
 NS_IMETHODIMP
 jsdContext::GetJSDContext(JSDContext **_rval)