diff --git a/debian/rules b/debian/rules
index e92a8c98cdfe23060e9b4ee8107479b13f362f25..e021eed5f18505154dac325d0abdfd11093d480f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -23,7 +23,7 @@ override_dh_compress:
 
 override_dh_fixperms:
 	dh_fixperms
-	chmod 770 $(TMP)/etc/backup.d
+	chmod 2770 $(TMP)/etc/backup.d
 
 override_dh_installchangelogs:
 	dh_installchangelogs ChangeLog