diff --git a/build-single.sh b/build-single.sh
index 9c1aabb..770e776 100755
--- a/build-single.sh
+++ b/build-single.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 TARGET_NAME="$1-$2"
 DOCKERFILE="Dockerfile.$1.$2"