diff --git a/cmake/README.md b/cmake/README.md
index 7e3b01013c..5a85994460 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -36,7 +36,7 @@
 
 Dockers: [![Status][docker_svg]][docker_link]
 
-[docker_svg]: https://github.com/google/or-tools/workflows/Docker%20CMake/badge.svg
+[docker_svg]: https://github.com/google/or-tools/workflows/Docker%20CMake/badge.svg?branch=master
 [docker_link]: https://github.com/google/or-tools/actions?query=workflow%3A"Docker+CMake"