diff --git a/src/agents/function_schema.py b/src/agents/function_schema.py
index 26d6d1f3b8..378715dcb4 100644
--- a/src/agents/function_schema.py
+++ b/src/agents/function_schema.py
@@ -139,7 +139,7 @@ def _detect_docstring_style(doc: str) -> DocstringStyle:
 def _suppress_griffe_logging():
     # Suppresses warnings about missing annotations for params
     logger = logging.getLogger("griffe")
-    previous_level = logger.getEffectiveLevel()
+    previous_level = logger.level
     logger.setLevel(logging.ERROR)
     try:
         yield
diff --git a/tests/test_function_schema_logger_restore.py b/tests/test_function_schema_logger_restore.py
new file mode 100644
index 0000000000..c67acbacb4
--- /dev/null
+++ b/tests/test_function_schema_logger_restore.py
@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import logging
+
+from agents.function_schema import _suppress_griffe_logging
+
+
+def test_suppress_griffe_logging_restores_configured_notset_level() -> None:
+    logger = logging.getLogger("griffe")
+    root_logger = logging.getLogger()
+    previous_logger_level = logger.level
+    previous_root_level = root_logger.level
+
+    try:
+        logger.setLevel(logging.NOTSET)
+        root_logger.setLevel(logging.WARNING)
+        assert logger.getEffectiveLevel() == logging.WARNING
+
+        with _suppress_griffe_logging():
+            assert logger.level == logging.ERROR
+
+        assert logger.level == logging.NOTSET
+        assert logger.getEffectiveLevel() == logging.WARNING
+    finally:
+        logger.setLevel(previous_logger_level)
+        root_logger.setLevel(previous_root_level)