diff --git a/convert.py b/convert.py
index 78948848f..f4ccfffab 100644
--- a/convert.py
+++ b/convert.py
@@ -10,6 +10,7 @@
 #
 
 import os
+import sys
 import logging
 from argparse import ArgumentParser
 import shutil
@@ -27,6 +28,7 @@
 colmap_command = '"{}"'.format(args.colmap_executable) if len(args.colmap_executable) > 0 else "colmap"
 magick_command = '"{}"'.format(args.magick_executable) if len(args.magick_executable) > 0 else "magick"
 use_gpu = 1 if not args.no_gpu else 0
+exit = lambda code: sys.exit(code if code <= 255 else 1)
 
 if not args.skip_matching:
     os.makedirs(args.source_path + "/distorted/sparse", exist_ok=True)