diff --git a/README.rst b/README.rst
index 4f5ddee1b..efa1eeeee 100644
--- a/README.rst
+++ b/README.rst
@@ -1,8 +1,8 @@
 .. image:: doc/logo/artiq.png
 .. image:: https://travis-ci.org/m-labs/artiq.svg
     :target: https://travis-ci.org/m-labs/artiq
-.. image:: https://coveralls.io/repos/m-labs/artiq/badge.svg
-    :target: https://coveralls.io/r/m-labs/artiq
+.. image:: https://coveralls.io/repos/m-labs/artiq/badge.svg?branch=master
+    :target: https://coveralls.io/r/m-labs/artiq?branch=master
 
 ARTIQ (Advanced Real-Time Infrastructure for Quantum physics) is a
 next-generation control system for quantum information experiments. It is