diff --git a/content/engine/swarm/swarm-tutorial/_index.md b/content/engine/swarm/swarm-tutorial/_index.md
index da7ba91faf4..b19f0c9b459 100644
--- a/content/engine/swarm/swarm-tutorial/_index.md
+++ b/content/engine/swarm/swarm-tutorial/_index.md
@@ -92,7 +92,7 @@ additional hardening is suggested:
 
 ```bash
 # Example iptables rule (order and other tools may require customization)
-iptables -I INPUT -m udp —-dport 4789 -m policy --dir in --pol none -j DROP
+iptables -I INPUT -m udp --dport 4789 -m policy --dir in --pol none -j DROP
 ```
 
 ## What's next?