diff --git a/include/timing.h b/include/timing.h
index 288e396de2c..f4f65af28a2 100644
--- a/include/timing.h
+++ b/include/timing.h
@@ -101,7 +101,7 @@ TimingElapsedTimeToString(PRTime time, char* buffer, PRUint32 size);
 
 PR_END_EXTERN_C
 
-#if defined(NO_TIMING)
+#if !defined(MOZ_TIMING)
 
 #define TIMING_MESSAGE(args)                       ((void) 0)
 #define TIMING_STARTCLOCK_NAME(op, name)           ((void) 0)
@@ -109,7 +109,7 @@ PR_END_EXTERN_C
 #define TIMING_STARTCLOCK_OBJECT(op, obj)          ((void) 0)
 #define TIMING_STOPCLOCK_OBJECT(op, obj, cx, msg)  ((void) 0)
 
-#else /* !defined(NO_TIMING) */
+#else /* !defined(MOZ_TIMING) */
 
 /**
  * Use this macro to log timing information. It uses the