diff --git a/providers/amazon/tests/unit/amazon/aws/executors/eks/test__client_factory.py b/providers/amazon/tests/unit/amazon/aws/executors/eks/test__client_factory.py
index 29ffa632d0ca1..45306e27316a5 100644
--- a/providers/amazon/tests/unit/amazon/aws/executors/eks/test__client_factory.py
+++ b/providers/amazon/tests/unit/amazon/aws/executors/eks/test__client_factory.py
@@ -21,6 +21,7 @@
 import signal
 import tempfile
 import threading
+import time
 from base64 import b64encode
 from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
@@ -152,6 +153,8 @@ def test_concurrent_builds_never_change_sts_regional_endpoints_env_var(self, moc
         def watch():
             while building.is_set():
                 seen.add(os.environ.get("AWS_STS_REGIONAL_ENDPOINTS"))
+                # A bare spin loop holds the GIL against the builders and can push the test past its timeout.
+                time.sleep(0.001)
 
         building.set()
         watcher = threading.Thread(target=watch)