diff --git a/paddlehub/utils/platform.py b/paddlehub/utils/platform.py
index 49b215433a2fb5444f44eba5dff1f53a452671f3..2a77cd6b0acc05c330805e07ee1a8abe304d0b14 100644
--- a/paddlehub/utils/platform.py
+++ b/paddlehub/utils/platform.py
@@ -21,7 +21,7 @@ def get_platform() -> str:
     return platform.platform()
 
 
-def is_windows() -> str:
+def is_windows() -> bool:
     return get_platform().lower().startswith("windows")