diff --git a/flytekit/core/obstore_filesystem.py b/flytekit/core/obstore_filesystem.py
index 26ee3dec58..5d5fb8d77a 100644
--- a/flytekit/core/obstore_filesystem.py
+++ b/flytekit/core/obstore_filesystem.py
@@ -18,7 +18,7 @@ class ObstoreS3FileSystem(AsyncFsspecStore):
     connect_timeout = 5
     retries = 5
     read_timeout = 15
-    default_block_size = 5 * 2**20
+    default_block_size = DEFAULT_BLOCK_SIZE
     protocol = ("s3", "s3a")
     _extra_tokenize_attributes = ("default_block_size",)