diff --git a/contrib/sync-upstream.sh b/contrib/sync-upstream.sh
index b72744f4..687420d8 100755
--- a/contrib/sync-upstream.sh
+++ b/contrib/sync-upstream.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -eou pipefail
 
diff --git a/src/modules/ecdsa_s2c/main_impl.h b/src/modules/ecdsa_s2c/main_impl.h
old mode 100755
new mode 100644