diff --git a/engine/swarm/networking.md b/engine/swarm/networking.md
index 308befcddd..d5a9783cf3 100644
--- a/engine/swarm/networking.md
+++ b/engine/swarm/networking.md
@@ -330,7 +330,7 @@ services which publish ports, such as a WordPress service which publishes port
       --ingress \
       --subnet=10.11.0.0/16 \
       --gateway=10.11.0.2 \
-      --opt com.docker.network.mtu=1200 \
+      --opt com.docker.network.driver.mtu=1200 \
       my-ingress
     ```