diff --git a/mmskeleton/utils/third_party.py b/mmskeleton/utils/third_party.py
index b9d1a2c01..1015333f7 100644
--- a/mmskeleton/utils/third_party.py
+++ b/mmskeleton/utils/third_party.py
@@ -1,8 +1,8 @@
 import lazy_import
 
 pycocotools = lazy_import.lazy_module("pycocotools")
-COCO = lazy_import.lazy_module("pycocotools.COCO")
-COCOeval = lazy_import.lazy_module("pycocotools.COCOeval")
+COCO = lazy_import.lazy_module("pycocotools.coco")
+COCOeval = lazy_import.lazy_module("pycocotools.cocoeval")
 mmdet = lazy_import.lazy_module("mmdet")
 lazy_import.lazy_module("mmdet.apis")
 
@@ -13,4 +13,4 @@ def is_exist(module_name):
         lazy_import._load_module(module)
         return True
     except ImportError:
-        return False
\ No newline at end of file
+        return False