diff --git a/src/cloudforet/cost_analysis/manager/cost_manager.py b/src/cloudforet/cost_analysis/manager/cost_manager.py
index 48345bf..c468cd9 100644
--- a/src/cloudforet/cost_analysis/manager/cost_manager.py
+++ b/src/cloudforet/cost_analysis/manager/cost_manager.py
@@ -675,7 +675,7 @@ def _convert_tags_str_to_dict(tags_str: Union[str, None]) -> dict:
                 tags_info: dict = json.loads(tags_str)
 
                 for key in tags_info.keys():
-                    if "." not in key:
+                    if len(key.split(".")) == 1:
                         tags[key] = tags_info[key]
 
             return tags