diff --git a/hb_server/apps/hrm/services.py b/hb_server/apps/hrm/services.py
index 14f5eb1..7cdc013 100644
--- a/hb_server/apps/hrm/services.py
+++ b/hb_server/apps/hrm/services.py
@@ -7,6 +7,7 @@ from apps.system.models import User
 
 class HRMService:
 
+    @classmethod
     def face_compare_from_base64(cls, base64_data):
         filename = str(uuid.uuid4())
         filepath = settings.BASE_DIR +'/temp/' + filename +'.png'