diff --git a/test/zdtm.sh b/test/zdtm.sh
index 9cb40305a..7cfbbe757 100755
--- a/test/zdtm.sh
+++ b/test/zdtm.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 ZP="zdtm/live"