diff --git a/net.c b/net.c
index dbca77b..32ca50e 100644
--- a/net.c
+++ b/net.c
@@ -691,8 +691,9 @@
 {
     int i;
 
-    if (!arg || strcmp(arg, "?"))
+    if (!arg || !is_help_option(arg)) {
         return 0;
+    }
 
     fprintf(stderr, "qemu: Supported NIC models: ");
     for (i = 0 ; models[i]; i++)