diff --git a/js/src/jsgc.h b/js/src/jsgc.h
index 0c874aeb994b..9a781c622b76 100644
--- a/js/src/jsgc.h
+++ b/js/src/jsgc.h
@@ -39,6 +39,7 @@
  */
 #include "jsprvtd.h"
 #include "jspubtd.h"
+#include "jsdhash.h"
 
 JS_BEGIN_EXTERN_C