diff --git a/main.py b/main.py
index c5f1e9c..f965d7e 100755
--- a/main.py
+++ b/main.py
@@ -198,6 +198,10 @@ class _Repo(object):
       else:
         print('error: project group must be enabled for the project in the current directory', file=sys.stderr)
       result = 1
+    except SystemExit as e:
+      if e.code:
+        result = e.code
+      raise
     finally:
       elapsed = time.time() - start
       hours, remainder = divmod(elapsed, 3600)