diff --git a/.gitmodules b/.gitmodules
index 5b2a14da5..48686a8d6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "yosys"]
 	path = yosys
 	url = https://github.com/YosysHQ/yosys
+    branch = master