diff --git a/devstack/common_settings b/devstack/common_settings
index bb3d6fe312..f66807adf9 100644
--- a/devstack/common_settings
+++ b/devstack/common_settings
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 if [[ -f $TOP_DIR/../../old/devstack/.localrc.auto ]]; then
     source <(cat $TOP_DIR/../../old/devstack/.localrc.auto | grep -v 'enable_plugin')
 fi