diff --git a/README.md b/README.md
index 66ed7aea..4b31ce04 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Alertmanager.
 
 ## Running tests
 
-[![Build Status](https://travis-ci.org/prometheus/alertmanager.svg)](https://travis-ci.org/prometheus/alertmanager)
+[![Build Status](https://travis-ci.org/prometheus/alertmanager.svg?branch=master)](https://travis-ci.org/prometheus/alertmanager)
 
     make test