diff --git a/cmd/q3rcon-proxy/main.go b/cmd/q3rcon-proxy/main.go
index f1618e8..aea1a3a 100644
--- a/cmd/q3rcon-proxy/main.go
+++ b/cmd/q3rcon-proxy/main.go
@@ -4,6 +4,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"net"
 	"os"
 	"runtime/debug"
 	"strconv"
@@ -158,18 +159,18 @@ func main() {
 func launchProxy(cfg proxyConfig, errChan chan<- error) {
 	proxyPort, targetPort := cfg.portsMapping[0], cfg.portsMapping[1]
 
-	hostAddr := fmt.Sprintf("%s:%s", cfg.proxyHost, proxyPort)
-	proxyAddr := fmt.Sprintf("%s:%s", cfg.targetHost, targetPort)
+	proxyAddr := net.JoinHostPort(cfg.proxyHost, proxyPort)
+	targetAddr := net.JoinHostPort(cfg.targetHost, targetPort)
 
 	server, err := udpproxy.New(
-		hostAddr, proxyAddr,
+		proxyAddr, targetAddr,
 		udpproxy.WithSessionTimeout(time.Duration(cfg.sessionTimeout)*time.Minute))
 	if err != nil {
 		errChan <- fmt.Errorf("failed to create proxy: %w", err)
 		return
 	}
 
-	log.Infof("q3rcon-proxy initialised: [proxy] (%s) [target] (%s)", hostAddr, proxyAddr)
+	log.Infof("q3rcon-proxy initialised: [proxy] (%s) [target] (%s)", proxyAddr, targetAddr)
 
 	errChan <- server.ListenAndServe()
 }