diff --git a/makefiles/README.md b/makefiles/README.md
index 6f89c1877f..e3c35ce446 100644
--- a/makefiles/README.md
+++ b/makefiles/README.md
@@ -1,7 +1,7 @@
 # OR-Tools Makefile Build Instructions
 [![Status][docker_svg]][docker_link]
 
-[docker_svg]: https://github.com/google/or-tools/workflows/Docker%20Make/badge.svg
+[docker_svg]: https://github.com/google/or-tools/workflows/Docker%20Make/badge.svg?branch=master
 [docker_link]: https://github.com/google/or-tools/actions?query=workflow%3A"Docker+Make"
 
 ## Introduction