diff --git a/src/rupload/app.py b/src/rupload/app.py
index 62557d3..f04d52e 100644
--- a/src/rupload/app.py
+++ b/src/rupload/app.py
@@ -23,7 +23,7 @@ class Rupload(web.Application):
         return pathlib.Path(self.upload_path).stat().st_size > self.upload_folder_quota
 
     def generate_upload_url(self, filename):
-        return self.upload_url + filename
+        return self.upload_url + "/" + filename
 
 
 UPLOAD_PAGE = """