diff --git a/lxc-build b/lxc-build
index d9eb5d1..3cfe621 100755
--- a/lxc-build
+++ b/lxc-build
@@ -81,9 +81,10 @@ def fix_world():
 def run_script():
     script_filename = os.path.join(LXC_ROOT, layers[-1], 'run.sh')
     with open(script_filename, 'w') as fd:
+        fd.write('#!/bin/sh\nset -ev\n')
         fd.write(' && '.join([s for s in script]))
     os.chmod(script_filename, 0o700)
-    subprocess.run(['lxc-execute', '-n', image, '--', '/bin/sh', '-lvc', '/run.sh'], check=True)
+    subprocess.run(['lxc-execute', '-n', image, '--', '/bin/sh', '-lc', '/run.sh'], check=True)
     os.unlink(script_filename)
 
 def copy_files(src, dst):