diff --git a/README.md b/README.md
index 6ee5ace1..acb9e3ed 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Oxipng
 
-[![Build Status](https://travis-ci.org/shssoichiro/oxipng.svg)](https://travis-ci.org/shssoichiro/oxipng)
+[![Build Status](https://travis-ci.org/shssoichiro/oxipng.svg?branch=master)](https://travis-ci.org/shssoichiro/oxipng)
 [![Version](https://img.shields.io/crates/v/oxipng.svg)](https://crates.io/crates/oxipng)
 [![License](https://img.shields.io/crates/l/oxipng.svg)](https://github.com/shssoichiro/oxipng/blob/master/LICENSE)