diff --git a/python/langsmith/client.py b/python/langsmith/client.py
index 8c36c7aea..d0c57f8a2 100644
--- a/python/langsmith/client.py
+++ b/python/langsmith/client.py
@@ -5795,7 +5795,6 @@ def _tracing_thread_handle_batch(
 _AUTO_SCALE_UP_NTHREADS_LIMIT = 16
 _AUTO_SCALE_DOWN_NEMPTY_TRIGGER = 4
 _BLOCKSIZE_BYTES = 1024 * 1024  # 1MB
-_USE_MULTIPART = os.getenv("LANGSMITH_FF_MULTIPART") in ["1", "true"]
 
 
 def _ensure_ingest_config(
@@ -5829,7 +5828,7 @@ def _tracing_control_thread_func(client_ref: weakref.ref[Client]) -> None:
     size_limit: int = batch_ingest_config["size_limit"]
     scale_up_nthreads_limit: int = batch_ingest_config["scale_up_nthreads_limit"]
     scale_up_qsize_trigger: int = batch_ingest_config["scale_up_qsize_trigger"]
-    use_multipart = _USE_MULTIPART
+    use_multipart = os.getenv("LANGSMITH_FF_MULTIPART") in ["1", "true"]
     # use_multipart = batch_ingest_config.get("use_multipart_endpoint", False)
     # TODO replace FF with reading from batch_ingest_config