diff --git a/xpcom/sample/nsSampleModule.cpp b/xpcom/sample/nsSampleModule.cpp
index 9acc6770efa7..6860c87229ac 100644
--- a/xpcom/sample/nsSampleModule.cpp
+++ b/xpcom/sample/nsSampleModule.cpp
@@ -252,7 +252,7 @@ extern "C" NS_EXPORT nsresult NSGetModule(nsIComponentManager *servMgr,
     nsresult rv = NS_OK;
 
     NS_ENSURE_ARG_POINTER(return_cobj);
-    NS_ENSURE_NOT(gModule, NS_ERROR_FAILURE);
+    NS_ENSURE_FALSE(gModule, NS_ERROR_FAILURE);
 
     // Create and initialize the module instance
     nsSampleModule *m = new nsSampleModule();