diff --git a/tests/transports/test_base.py b/tests/transports/test_base.py
index 2f77c3e95..928d82ddb 100644
--- a/tests/transports/test_base.py
+++ b/tests/transports/test_base.py
@@ -178,7 +178,7 @@ def test_api_request_size_dynamic(mock_flush, caplog, elasticapm_client):
     try:
         with caplog.at_level("DEBUG", "elasticapm.transport"):
             transport.queue("error", "".join(random.choice(string.ascii_letters) for i in range(2000)))
-            transport._flushed.wait(timeout=0.1)
+            transport.flush()
         _cleanup_flush_mock_buffers(mock_flush)
         assert mock_flush.call_count == 1
         elasticapm_client.config.update(version="1", api_request_size="1mb")