diff --git a/extensions/python/xpcom/src/PyGBase.cpp b/extensions/python/xpcom/src/PyGBase.cpp
index 34ec66cff8dc..de52a3162bda 100644
--- a/extensions/python/xpcom/src/PyGBase.cpp
+++ b/extensions/python/xpcom/src/PyGBase.cpp
@@ -395,7 +395,6 @@ PyG_Base::GetWeakReference(nsIWeakReference **ret)
 	}
 	NS_PRECONDITION(ret, "null pointer");
 	if (ret==nsnull) return NS_ERROR_INVALID_POINTER;
-	// explicit QI back to nsISupports
 	if (!m_pWeakRef) {
 		// First query for a weak reference - create it.
 		m_pWeakRef = new PyXPCOM_GatewayWeakReference(this);