diff --git a/setup/dkim.sh b/setup/dkim.sh
index 8d82f971..5ea1223d 100644
--- a/setup/dkim.sh
+++ b/setup/dkim.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # OpenDKIM
 # --------
 #
diff --git a/setup/webmail.sh b/setup/webmail.sh
index 3fc109e0..a50b8aa6 100755
--- a/setup/webmail.sh
+++ b/setup/webmail.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # Webmail with Roundcube
 # ----------------------