diff --git a/vpn/bridge/meta/argument_specs.yml b/vpn/bridge/meta/argument_specs.yml
index ea0a3d7..7a942b9 100644
--- a/vpn/bridge/meta/argument_specs.yml
+++ b/vpn/bridge/meta/argument_specs.yml
@@ -19,7 +19,7 @@ argument_specs:
       vpn_bridge_broadcast:
         type: "str"
         required: true
-      vpn_bridge_netmask:
+      vpn_bridge_prefixlen:
         type: "str"
         required: true
       vpn_bridge_subnet:
diff --git a/vpn/bridge/templates/br0 b/vpn/bridge/templates/br0
index ae777d2..9a3aecf 100644
--- a/vpn/bridge/templates/br0
+++ b/vpn/bridge/templates/br0
@@ -23,4 +23,4 @@ iface br0 inet static
 
     address {{ vpn_bridge_address }}
     broadcast {{ vpn_bridge_broadcast }}
-    netmask {{ vpn_bridge_netmask }}
+    netmask {{ vpn_bridge_prefixlen }}