diff --git a/freqtrade/rpc/api_server/web_ui.py b/freqtrade/rpc/api_server/web_ui.py
index e1a277b30..b701b4901 100644
--- a/freqtrade/rpc/api_server/web_ui.py
+++ b/freqtrade/rpc/api_server/web_ui.py
@@ -30,7 +30,7 @@ async def ui_version():
     }
 
 
-def is_relative_to(path, base) -> bool:
+def is_relative_to(path: Path, base: Path) -> bool:
     # Helper function simulating behaviour of is_relative_to, which was only added in python 3.9
     try:
         path.relative_to(base)