diff --git a/deps/buildcore/scripts/pybb.py b/deps/buildcore/scripts/pybb.py
index 43d6a0a9..d5dfc7d0 100755
--- a/deps/buildcore/scripts/pybb.py
+++ b/deps/buildcore/scripts/pybb.py
@@ -31,7 +31,7 @@ def cat(paths: List[str]) -> int:
     return 0
 
 
-def mkdir(path: str) -> int:
+def mkdir(path: str):
     if not os.path.exists(path):
         os.mkdir(path)