diff --git a/debian/helper-script/phpggc b/debian/helper-script/phpggc
index 4cc62fd..dcaf138 100755
--- a/debian/helper-script/phpggc
+++ b/debian/helper-script/phpggc
@@ -1,4 +1,6 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
-cd /usr/share/phpggc
+set -e
+
+cd /usr/share/phpggc/
 exec ./phpggc "$@"