diff --git a/mem0/vector_stores/milvus.py b/mem0/vector_stores/milvus.py
index 80a4d0ffa..6c8ae885f 100644
--- a/mem0/vector_stores/milvus.py
+++ b/mem0/vector_stores/milvus.py
@@ -262,7 +262,7 @@ class MilvusDB(VectorStoreBase):
         Args:
             vector_id (str): ID of the vector to delete.
         """
-        self.client.delete(collection_name=self.collection_name, ids=vector_id)
+        self.client.delete(collection_name=self.collection_name, ids=[vector_id])
 
     def update(self, vector_id=None, vector=None, payload=None):
         """
diff --git a/tests/vector_stores/test_milvus.py b/tests/vector_stores/test_milvus.py
index b0109ca56..9acd84140 100644
--- a/tests/vector_stores/test_milvus.py
+++ b/tests/vector_stores/test_milvus.py
@@ -178,7 +178,7 @@ class TestMilvusDB:
         
         mock_milvus_client.delete.assert_called_once_with(
             collection_name="test_collection",
-            ids=vector_id
+            ids=[vector_id]
         )
 
     def test_get(self, milvus_db, mock_milvus_client):