diff --git a/test/test_helper/common.bash b/test/test_helper/common.bash
index b495a4fd..b9e82542 100644
--- a/test/test_helper/common.bash
+++ b/test/test_helper/common.bash
@@ -1,3 +1,5 @@
+#! /bin/bash
+
 load 'test_helper/bats-support/load'
 load 'test_helper/bats-assert/load'