diff --git a/js/src/jsnum.c b/js/src/jsnum.c
index 924eb1bbac7a..85cdb5a33e8d 100644
--- a/js/src/jsnum.c
+++ b/js/src/jsnum.c
@@ -19,7 +19,6 @@
 /*
  * JS number type and wrapper class.
  */
-#include "jsstddef.h"
 #include <errno.h>
 #ifdef XP_PC
 #include <float.h>