diff --git a/js/src/jsvector.h b/js/src/jsvector.h
index 4f68e63e64b..bfdcc339fdf 100644
--- a/js/src/jsvector.h
+++ b/js/src/jsvector.h
@@ -43,6 +43,7 @@
 #include <string.h>
 #include <new>
 
+#include "jsutil.h"
 #include "jsbit.h"
 
 /* Library of template meta-programs for use in the C++ JS data-structures. */