diff --git a/mem0/vector_stores/chroma.py b/mem0/vector_stores/chroma.py
index 12f43cb4b..b37872643 100644
--- a/mem0/vector_stores/chroma.py
+++ b/mem0/vector_stores/chroma.py
@@ -169,7 +169,7 @@ class ChromaDB(VectorStoreBase):
         Args:
             vector_id (str): ID of the vector to delete.
         """
-        self.collection.delete(ids=vector_id)
+        self.collection.delete(ids=[vector_id])
 
     def update(
         self,
diff --git a/tests/vector_stores/test_chroma.py b/tests/vector_stores/test_chroma.py
index dead40ba4..f13d3d8d2 100644
--- a/tests/vector_stores/test_chroma.py
+++ b/tests/vector_stores/test_chroma.py
@@ -122,7 +122,7 @@ def test_delete_vector(chromadb_instance):
 
     chromadb_instance.delete(vector_id=vector_id)
 
-    chromadb_instance.collection.delete.assert_called_once_with(ids=vector_id)
+    chromadb_instance.collection.delete.assert_called_once_with(ids=[vector_id])
 
 
 def test_update_vector(chromadb_instance):