diff --git a/build/build.sh b/build/build.sh
index 3ead649..5f8a1f3 100755
--- a/build/build.sh
+++ b/build/build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Copyright 2016 The Kubernetes Authors.
 #