diff --git a/src/flask/sansio/app.py b/src/flask/sansio/app.py
index da3b4ecc..98ef2c0a 100644
--- a/src/flask/sansio/app.py
+++ b/src/flask/sansio/app.py
@@ -679,7 +679,7 @@ class App(Scaffold):
         def decorator(f: T_template_filter) -> T_template_filter:
             self.add_template_filter(f, name=name)
             return f
-        
+
         if not f:
             return decorator
         return decorator(f)