diff --git a/launch_testing/launch_testing/legacy/__init__.py b/launch_testing/launch_testing/legacy/__init__.py
index bfe094a86..ccc3ebb2d 100644
--- a/launch_testing/launch_testing/legacy/__init__.py
+++ b/launch_testing/launch_testing/legacy/__init__.py
@@ -195,7 +195,6 @@ def add_output_test(
         assert any(match_patterns)
 
         def on_process_exit(event, context):
-            nonlocal match_patterns
             if any(match_patterns):
                 # Finish test instead of failing to prevent process exit
                 # and process output event handlers from racing.
@@ -208,7 +207,6 @@ def on_process_exit(event, context):
         )
 
         def on_shutdown(event, context):
-            nonlocal match_patterns
             if any(match_patterns):
                 process_name = action.process_details['name']
                 reason = 'not all {} output matched!'.format(process_name)