diff --git a/src/tools/tools.go b/src/tools/tools.go
index 2cbc0b1..854e91b 100644
--- a/src/tools/tools.go
+++ b/src/tools/tools.go
@@ -420,7 +420,7 @@ func startScheduler() {
 	if host == "" || host == "0.0.0.0" || host == "::" {
 		host = "localhost"
 	}
-	apiURL := "http://" + host + ":" + port
+	apiURL := "http://" + net.JoinHostPort(host, port)
 	dbPath := filepath.Join(cfg.AppDataPath, "db", "scheduler.db")
 
 	// Clean up stale port file from previous run