diff --git a/styleguide/format.py b/styleguide/format.py
index 5736ea81de..4aa22b2b1d 100755
--- a/styleguide/format.py
+++ b/styleguide/format.py
@@ -22,7 +22,7 @@ def main():
     args = ["python", path + "/format.py"]
     args.extend(sys.argv[1:])
     proc = subprocess.Popen(args)
-    proc.wait()
+    sys.exit(proc.wait())
 
 if __name__ == "__main__":
     main()