diff --git a/repos/os/src/server/nic_router/component.h b/repos/os/src/server/nic_router/component.h
index b5ed338697..90545d785f 100644
--- a/repos/os/src/server/nic_router/component.h
+++ b/repos/os/src/server/nic_router/component.h
@@ -126,9 +126,9 @@ class Net::Session_component : private Session_component_base,
 		 ** Nic::Session **
 		 ******************/
 
-		Mac_address mac_address() { return _mac; }
-		bool link_state() { return Interface::link_state(); }
-		void link_state_sigh(Genode::Signal_context_capability sigh) { Interface::link_state_sigh(sigh); }
+		Mac_address mac_address() override { return _mac; }
+		bool link_state() override { return Interface::link_state(); }
+		void link_state_sigh(Genode::Signal_context_capability sigh) override { Interface::link_state_sigh(sigh); }
 };
 
 
@@ -150,7 +150,7 @@ class Net::Root : public Genode::Root_component<Session_component>
 		 ** Root_component **
 		 ********************/
 
-		Session_component *_create_session(char const *args);
+		Session_component *_create_session(char const *args) override;
 
 	public:
 
diff --git a/repos/os/src/server/nic_router/uplink.h b/repos/os/src/server/nic_router/uplink.h
index 3e5ab0541f..30a1375a14 100644
--- a/repos/os/src/server/nic_router/uplink.h
+++ b/repos/os/src/server/nic_router/uplink.h
@@ -69,8 +69,8 @@ class Net::Uplink : public Uplink_base,
 		 ** Net::Interface **
 		 ********************/
 
-		Packet_stream_sink   &_sink()   { return *rx(); }
-		Packet_stream_source &_source() { return *tx(); }
+		Packet_stream_sink   &_sink()   override { return *rx(); }
+		Packet_stream_source &_source() override { return *tx(); }
 
 	public: