diff --git a/scripts/domcon-brute.nse b/scripts/domcon-brute.nse
index 99941d4c1..8915043f3 100644
--- a/scripts/domcon-brute.nse
+++ b/scripts/domcon-brute.nse
@@ -35,7 +35,7 @@ license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 categories = {"intrusive", "brute"}
 
 
-portrule = shortport.port_or_service(2050, "", "tcp", "open")
+portrule = shortport.portnumber(2050, "tcp", "open")
 
 local not_admins = {}