diff --git a/hashes/contrib/test.sh b/hashes/contrib/test.sh
index bdd3462f..b5a2a8b0 100755
--- a/hashes/contrib/test.sh
+++ b/hashes/contrib/test.sh
@@ -1,4 +1,6 @@
-#!/bin/sh -ex
+#!/bin/sh
+
+set -ex
 
 FEATURES="serde serde-std std core2"