diff --git a/src/network/core/address.cpp b/src/network/core/address.cpp
index ecf7e2e1a4..09ea55419b 100644
--- a/src/network/core/address.cpp
+++ b/src/network/core/address.cpp
@@ -308,7 +308,7 @@ static SOCKET ListenLoopProc(addrinfo *runp)
 	}
 
 	if (runp->ai_socktype != SOCK_DGRAM && listen(sock, 1) != 0) {
-		DEBUG(net, 1, "[%s] could not listen at % port %s: %s", type, family, address, strerror(errno));
+		DEBUG(net, 1, "[%s] could not listen at %s port %s: %s", type, family, address, strerror(errno));
 		closesocket(sock);
 		return INVALID_SOCKET;
 	}
diff --git a/src/network/network_udp.cpp b/src/network/network_udp.cpp
index 59fbd7dc63..54b24e6b75 100644
--- a/src/network/network_udp.cpp
+++ b/src/network/network_udp.cpp
@@ -507,8 +507,8 @@ void NetworkUDPAdvertiseThread(void *pntr)
 		DEBUG(net, 0, "[udp] advertising to the master server is failing");
 		DEBUG(net, 0, "[udp]   we are not receiving the acknowledgement from the server");
 		DEBUG(net, 0, "[udp]   this usually means that the master server cannot reach us");
-		DEBUG(net, 0, "[udp]   please allow udp and tcp packets to port %s to be delivered", _settings_client.network.server_port);
-		DEBUG(net, 0, "[udp]   please allow udp and tcp packets from port %s to be delivered", _settings_client.network.server_port);
+		DEBUG(net, 0, "[udp]   please allow udp and tcp packets to port %u to be delivered", _settings_client.network.server_port);
+		DEBUG(net, 0, "[udp]   please allow udp and tcp packets from port %u to be delivered", _settings_client.network.server_port);
 	}
 
 	/* Send the packet */