diff --git a/.gitmodules b/.gitmodules
index 8a9e5129b0..bc7268e195 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -66,3 +66,4 @@
 [submodule "src/drivers/uavcan_v1/legacy_data_types"]
 	path = src/drivers/uavcan_v1/legacy_data_types
 	url = https://github.com/px4/public_regulated_data_types/
+	branch = legacy