diff --git a/docker/php/scripts/wait-mariadb.sh b/docker/php/scripts/wait-mariadb.sh
index 822cb0c..74ea689 100644
--- a/docker/php/scripts/wait-mariadb.sh
+++ b/docker/php/scripts/wait-mariadb.sh
@@ -1,3 +1,5 @@
+#!/bin/sh
+
 until nc -z mariadb 3306; do
   sleep 2
-done
\ No newline at end of file
+done