diff --git a/README.md b/README.md
index e5e3b39..cc6d6b7 100644
--- a/README.md
+++ b/README.md
@@ -186,7 +186,7 @@ There was only the test of `ants` Pool because my computer was crash when it rea
 
 [1]: https://travis-ci.com/panjf2000/ants.svg?branch=master
 [2]: https://travis-ci.com/panjf2000/ants
-[3]: https://codecov.io/gh/panjf2000/ants/branch/develop/graph/badge.svg
+[3]: https://codecov.io/gh/panjf2000/ants/branch/master/graph/badge.svg
 [4]: https://codecov.io/gh/panjf2000/ants
 [5]: https://goreportcard.com/badge/github.com/panjf2000/ants
 [6]: https://goreportcard.com/report/github.com/panjf2000/ants