diff --git a/mozilla/xpcom/ds/nsObserverList.cpp b/mozilla/xpcom/ds/nsObserverList.cpp
index edcb49b61c5..bdfce803b29 100644
--- a/mozilla/xpcom/ds/nsObserverList.cpp
+++ b/mozilla/xpcom/ds/nsObserverList.cpp
@@ -20,7 +20,7 @@
  * Contributor(s): 
  */
 
-#define NS_WEAK_OBSERVERS
+// #define NS_WEAK_OBSERVERS
 
 #define NS_IMPL_IDS
 #include "pratom.h"