diff --git a/libs/langchain/langchain/memory/chat_message_histories/dynamodb.py b/libs/langchain/langchain/memory/chat_message_histories/dynamodb.py
index 06d7897dbd..34ba5694d7 100644
--- a/libs/langchain/langchain/memory/chat_message_histories/dynamodb.py
+++ b/libs/langchain/langchain/memory/chat_message_histories/dynamodb.py
@@ -121,6 +121,6 @@ class DynamoDBChatMessageHistory(BaseChatMessageHistory):
             ) from e
 
         try:
-            self.table.delete_item(self.key)
+            self.table.delete_item(Key=self.key)
         except ClientError as err:
             logger.error(err)