diff --git a/PythonAPI/pycocotools/coco.py b/PythonAPI/pycocotools/coco.py
index a5d023ce25e4f48ef451bb04dba0c10f17ed6757..ca35cc0b053b4917bf65a634ee0651653e9ae4af 100644
--- a/PythonAPI/pycocotools/coco.py
+++ b/PythonAPI/pycocotools/coco.py
@@ -52,7 +52,7 @@ from matplotlib.patches import Polygon
 import numpy as np
 import copy
 import itertools
-import pycocotools.mask as maskUtils
+from . import mask as maskUtils
 import os
 from collections import defaultdict
 import sys
diff --git a/PythonAPI/pycocotools/cocoeval.py b/PythonAPI/pycocotools/cocoeval.py
index 21446971eb80048d351ea26dfd93efeedb3b3db8..cd4285271889e4bc52ef00bfb3366c34c92dc304 100644
--- a/PythonAPI/pycocotools/cocoeval.py
+++ b/PythonAPI/pycocotools/cocoeval.py
@@ -4,7 +4,7 @@ import numpy as np
 import datetime
 import time
 from collections import defaultdict
-import pycocotools.mask as maskUtils
+from . import mask as maskUtils
 import copy
 
 class COCOeval: