diff --git a/libuavcan/include/uavcan/protocol/global_time_sync_slave.hpp b/libuavcan/include/uavcan/protocol/global_time_sync_slave.hpp
index 04a84877ca..ddf6534851 100644
--- a/libuavcan/include/uavcan/protocol/global_time_sync_slave.hpp
+++ b/libuavcan/include/uavcan/protocol/global_time_sync_slave.hpp
@@ -26,8 +26,7 @@ class GlobalTimeSyncSlave : Noncopyable
     NodeID master_nid_;
     uint8_t prev_iface_index_;
 
-    ISystemClock& getSystemClock() { return sub_.getNode().getSystemClock(); }
-    const ISystemClock& getSystemClock() const { return sub_.getNode().getSystemClock(); }
+    ISystemClock& getSystemClock() const { return sub_.getNode().getSystemClock(); }
 
     void adjustFromMsg(const ReceivedDataStructure<protocol::GlobalTimeSync>& msg);