diff --git a/ros2_dotnet_rolling.repos b/ros2_dotnet_rolling.repos
index 5a05b733..87a32e0d 100644
--- a/ros2_dotnet_rolling.repos
+++ b/ros2_dotnet_rolling.repos
@@ -11,6 +11,10 @@ repositories:
     type: git
     url: https://github.com/ros2/rcl_interfaces.git
     version: rolling
+  ros2/rosidl_core:
+    type: git
+    url: https://github.com/ros2/rosidl_core.git
+    version: rolling
   ros2/rosidl_defaults:
     type: git
     url: https://github.com/ros2/rosidl_defaults.git