diff --git a/src/opnsense/scripts/interfaces/list_arp.py b/src/opnsense/scripts/interfaces/list_arp.py
index 05b48dda5..86f8f0c62 100755
--- a/src/opnsense/scripts/interfaces/list_arp.py
+++ b/src/opnsense/scripts/interfaces/list_arp.py
@@ -38,7 +38,7 @@ import watchers.dhcpd
 
 if __name__ == '__main__':
     # do we use reverse DNS lookup ?
-    arp_arg = '-an' if '-r' in sys.argv else '-a'
+    arp_arg = '-a' if '-r' in sys.argv else '-an'
 
     # index mac database (shipped with netaddr)
     macdb = dict()