diff --git a/libs/partners/anthropic/langchain_anthropic/chat_models.py b/libs/partners/anthropic/langchain_anthropic/chat_models.py
index dcabd30b647..60bd72868ec 100644
--- a/libs/partners/anthropic/langchain_anthropic/chat_models.py
+++ b/libs/partners/anthropic/langchain_anthropic/chat_models.py
@@ -1211,12 +1211,10 @@ def _make_message_chunk_from_anthropic_event(
             content_block["index"] = event.index
             content_block["type"] = "tool_use"
             tool_call_chunk = create_tool_call_chunk(
-                **{
-                    "index": event.index,
-                    "id": None,
-                    "name": None,
-                    "args": event.delta.partial_json,
-                }
+                index=event.index,
+                id=None,
+                name=None,
+                args=event.delta.partial_json,
             )
             message_chunk = AIMessageChunk(
                 content=[content_block],