diff --git a/tests/gpg/pinentry b/tests/gpg/pinentry
index 3b99726..b12caae 100755
--- a/tests/gpg/pinentry
+++ b/tests/gpg/pinentry
@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /bin/sh
 # Dummy pinentry
 # 
 # Copyright 2008 g10 Code GmbH