diff --git a/js/ref/files b/js/ref/files
index 953d61ce34d5..1a1f85471932 100644
--- a/js/ref/files
+++ b/js/ref/files
@@ -60,6 +60,7 @@ jsscope.c
 jsscope.h
 jsscript.c
 jsscript.h
+jsstddef.h
 jsstr.c
 jsstr.h
 jsxdrapi.c