diff --git a/instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py b/instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py
index 5df91f8d2b..3d2a100e92 100644
--- a/instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py
+++ b/instrumentation/opentelemetry-instrumentation-flask/src/opentelemetry/instrumentation/flask/__init__.py
@@ -116,7 +116,7 @@ def _start_response(status, response_headers, *args, **kwargs):
                         status,
                     )
                 if response_hook is not None:
-                    response_hook(span, status, response_headers)         
+                    response_hook(span, status, response_headers)
             return start_response(status, response_headers, *args, **kwargs)
 
         return wsgi_app(wrapped_app_environ, _start_response)