diff --git a/build.sh b/build.sh
index efface6..0bdfe17 100755
--- a/build.sh
+++ b/build.sh
@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/bin/bash -e
 
 # Concourse Worker doesn't support IPv6 well yet.
 function npm-ipv4() {
-    node --dns-result-order=ipv4first $(which npm) $*
+    node --dns-result-order=ipv4first $(which npm) "$*"
 }
 npm-ipv4 install -Dy
 npm-ipv4 -y exec webpack