diff --git a/layout/xul/base/src/nsBox.h b/layout/xul/base/src/nsBox.h
index b4f39a5da78f..ca2c4da231a9 100644
--- a/layout/xul/base/src/nsBox.h
+++ b/layout/xul/base/src/nsBox.h
@@ -42,8 +42,6 @@
 
 class nsITheme;
 
-#define DEFAULT_ORDINAL_GROUP 1
-
 #define NS_STATE_IS_ROOT        NS_FRAME_STATE_BIT(24)
 #define NS_STATE_SET_TO_DEBUG   NS_FRAME_STATE_BIT(26)
 #define NS_STATE_DEBUG_WAS_SET  NS_FRAME_STATE_BIT(27)