diff --git a/.hgignore b/.hgignore
index 959b58739f..90139f0238 100644
--- a/.hgignore
+++ b/.hgignore
@@ -138,6 +138,7 @@
 ^tools/firmware/vgabios/vbetables-gen$
 ^tools/firmware/vgabios/vbetables\.h$
 ^tools/flask/loadpolicy/flask-loadpolicy$
+^tools/fs-back/fs-backend$
 ^tools/include/xen/.*$
 ^tools/include/xen-foreign/.*\.(c|h|size)$
 ^tools/include/xen-foreign/checker$