diff --git a/opentelemetry-sdk/tests/trace/export/test_export.py b/opentelemetry-sdk/tests/trace/export/test_export.py
index 7a29ef3c42..4ce611c932 100644
--- a/opentelemetry-sdk/tests/trace/export/test_export.py
+++ b/opentelemetry-sdk/tests/trace/export/test_export.py
@@ -519,7 +519,8 @@ def test_batch_span_processor_reset_timeout(self):
             # since wait is mocked it should return immediately
             time.sleep(0.1)
             mock_wait_calls = list(mock_wait.mock_calls)
-
+            # Initialize after_calls to avoid UnboundLocalError
+            after_calls = []
             # find the index of the call that processed the singular span
             for idx, wait_call in enumerate(mock_wait_calls):
                 _, args, __ = wait_call