diff --git a/.gitignore b/.gitignore
index 468cd68d18ad7d2ae83486de4447aaee23420779..640f4cef784a8115de40921fd01e8272dd38e09b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@ external/
 
 MatlabAPI/analyze*/
 MatlabAPI/visualize*/
+MatlabAPI/private/maskApiMex.*
 
 PythonAPI/pycocotools/__init__.pyc
 PythonAPI/pycocotools/_mask.c