diff --git a/main.go b/main.go
index a38c5a2..b21497c 100644
--- a/main.go
+++ b/main.go
@@ -63,7 +63,7 @@ func main() {
 		go setupACME(s)
 	}
 
-	l, err := net.Listen("tcp", *webPort)
+	l, err := net.Listen("tcp", ":"+*webPort)
 	if err != nil {
 		log.Fatal(err)
 	}