diff --git a/app.py b/app.py
index 6f670531..90852e3b 100644
--- a/app.py
+++ b/app.py
@@ -114,7 +114,7 @@
     )
 
 
-def launch_gradio(server_name: str, server_port: int):
+def launch_gradio(server_name: str, server_port: int) -> None:
     Applio.launch(
         favicon_path="assets/ICON.ico",
         share="--share" in sys.argv,