diff --git a/protocol/testing/version/version.sh b/protocol/testing/version/version.sh
index 186be745b8..f7886f8c31 100755
--- a/protocol/testing/version/version.sh
+++ b/protocol/testing/version/version.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 CURRENT_VERSION=$(<VERSION_CURRENT)
 PREUPGRADE_VERSION=$(<VERSION_PREUPGRADE)