diff --git a/freqtrade/rpc/api_server/web_ui.py b/freqtrade/rpc/api_server/web_ui.py
index 6d397da56..4876c9077 100644
--- a/freqtrade/rpc/api_server/web_ui.py
+++ b/freqtrade/rpc/api_server/web_ui.py
@@ -22,10 +22,10 @@ async def index_html(rest_of_path: str):
         raise HTTPException(status_code=404, detail="Not Found")
     uibase = Path(__file__).parent / 'ui'
     if (uibase / rest_of_path).is_file():
-        return FileResponse(uibase / rest_of_path)
+        return FileResponse(str(uibase / rest_of_path))
 
     index_file = uibase / 'index.html'
     if not index_file.is_file():
-        return FileResponse(uibase / 'fallback_file.html')
+        return FileResponse(str(uibase / 'fallback_file.html'))
     # Fall back to index.html, as indicated by vue router docs
-    return FileResponse(index_file)
+    return FileResponse(str(index_file))