diff --git a/build.sh b/build.sh
index b151610..0ff96ec 100755
--- a/build.sh
+++ b/build.sh
@@ -1 +1,2 @@
+#!/bin/bash
 hugo && find public -path "*.html" -type f -exec tidy --quiet yes --drop-empty-elements no --hide-comments yes -o {} {} \;