diff --git a/tosfs/tests/test_fsspec_integration.py b/tosfs/tests/test_fsspec_integration.py
index fc08055..7a222d5 100644
--- a/tosfs/tests/test_fsspec_integration.py
+++ b/tosfs/tests/test_fsspec_integration.py
@@ -96,8 +96,11 @@ def test_customized_class(bucket, temporary_workspace):
 
     logger.error("----------------")
     logger.error("tos" in fsspec.registry)
-    logger.error(fsspec.registry["tos"])
-    logger.error(fsspec.registry.known_implementations["tos"])
+    logger.error(f"fsspec.registry {fsspec.registry}")
+    logger.error(
+        f"fsspec.registry.known_implementations "
+        f"{fsspec.registry.known_implementations}"
+    )
     logger.error(fsspec.get_filesystem_class("tos"))
 
     file = f"{random_str()}.txt"