diff --git a/pica-mail-mta/entrypoint.sh b/pica-mail-mta/entrypoint.sh
index d1b3ecf56081894a4c6bcc842e45dc3bdf52d399..e10c1ed6c4ba72a1f449e0fe29e6195e9ebc72c7 100755
--- a/pica-mail-mta/entrypoint.sh
+++ b/pica-mail-mta/entrypoint.sh
@@ -1,4 +1,4 @@
-
+#!/bin/bash
 postconf -e "myorigin = ${MY_ORIGIN}"
 echo ${MY_ORIGIN}
 postconf -e "myhostname=${MY_HOSTNAME}"