diff --git a/tests/wunit/pass.sh b/tests/wunit/pass.sh
index 1471d4c19..f96f41117 100755
--- a/tests/wunit/pass.sh
+++ b/tests/wunit/pass.sh
@@ -1,4 +1,4 @@
-#! /bin/sh
+#! /bin/bash
 
 set -e