diff --git a/update_site.sh b/update_site.sh
index 35df75f..6f1f828 100755
--- a/update_site.sh
+++ b/update_site.sh
@@ -1,3 +1,4 @@
+#!/bin/ash
 cd /websites/piquemouche
 git fetch >> update.log
 git merge master >> update.log