diff --git a/.hgignore b/.hgignore
index a43b61775bf3..84a037bbc915 100644
--- a/.hgignore
+++ b/.hgignore
@@ -29,6 +29,7 @@
 # Build directories for js shell
 _DBG\.OBJ/
 _OPT\.OBJ/
+^js/src/.*-obj/
 
 # SpiderMonkey configury
 ^js/src/configure$