diff --git a/cmvr-es/devices/motor/manager/include/motor_manager.h b/cmvr-es/devices/motor/manager/include/motor_manager.h
index 3673355a..0d52d8ea 100644
--- a/cmvr-es/devices/motor/manager/include/motor_manager.h
+++ b/cmvr-es/devices/motor/manager/include/motor_manager.h
@@ -54,6 +54,9 @@ public:
         std::vector<double>& positions,
         std::vector<double>& velocities) const;
 
+    // Linbo's arm backend does not use XT's per-joint claim registry.
+    std::string armOwnerForJoint(const std::string&) const { return {}; }
+
     static std::shared_ptr<MotorManager> managerFor(const std::string& id);
     static std::shared_ptr<simulate::MujocoWorld> mujocoWorldFor(const std::string& id);
     static void setActiveJoints(const std::string& motor_manager_id,