diff --git a/lightrag/utils_graph.py b/lightrag/utils_graph.py
index 5485d47c..c2ccd313 100644
--- a/lightrag/utils_graph.py
+++ b/lightrag/utils_graph.py
@@ -6,7 +6,7 @@ from typing import Any, cast
 
 from .base import DeletionResult
 from .kg.shared_storage import get_graph_db_lock
-from .prompt import GRAPH_FIELD_SEP
+from .constants import GRAPH_FIELD_SEP
 from .utils import compute_mdhash_id, logger
 from .base import StorageNameSpace