diff --git a/examples/rotuer.nix b/examples/rotuer.nix
index 324d518..ac7576e 100644
--- a/examples/rotuer.nix
+++ b/examples/rotuer.nix
@@ -78,12 +78,12 @@ in rec {
   };
 
   services.int =
-    let iface = svc.bridge.primary { ifname = "int"; };
+    let iface = svc.bridge.primary.build { ifname = "int"; };
     in address iface {
       family = "inet4"; address ="10.8.0.1"; prefixLength = 16;
     };
 
-  services.bridge = svc.bridge.members {
+  services.bridge = svc.bridge.members.build {
     primary = services.int;
     members = with config.hardware.networkInterfaces;  [
       wlan_24 lan wlan_5
diff --git a/modules/bridge/default.nix b/modules/bridge/default.nix
index 27329cd..173a39c 100644
--- a/modules/bridge/default.nix
+++ b/modules/bridge/default.nix
@@ -2,21 +2,36 @@
 let
   inherit (lib) mkOption types;
   inherit (pkgs.liminix.services) oneshot;
+  inherit (pkgs) liminix;
 in
 {
   options = {
     system.service.bridge = {
       primary = mkOption {
-        type = types.functionTo pkgs.liminix.lib.types.service;
+        type = liminix.lib.types.serviceDefn;
       };
       members = mkOption {
-        type = types.functionTo pkgs.liminix.lib.types.service;
+        type = liminix.lib.types.serviceDefn;
       };
     };
   };
-  config = {
-    system.service.bridge.primary = pkgs.callPackage ./primary.nix {};
-    system.service.bridge.members = pkgs.callPackage ./members.nix {};
-    kernel.config.BRIDGE = "y";
+  config.system.service.bridge = {
+    primary = liminix.callService ./primary.nix {
+      ifname = mkOption {
+        type = types.str;
+        description = "interface name for the bridge device";
+      };
+    };
+    members = liminix.callService ./members.nix {
+      members = mkOption {
+        type = types.listOf liminix.lib.types.service;
+        description = "interfaces to add to the bridge";
+      };
+      primary = mkOption {
+        type = liminix.lib.types.service;
+        description = "bridge interface to add them to";
+      };
+    };
   };
+  config.kernel.config.BRIDGE = "y";
 }
diff --git a/modules/bridge/members.nix b/modules/bridge/members.nix
index 537877d..24a23a5 100644
--- a/modules/bridge/members.nix
+++ b/modules/bridge/members.nix
@@ -3,25 +3,11 @@
 , ifwait
 , lib
 }:
+{ members, primary } :
 let
   inherit (liminix.networking) interface;
   inherit (liminix.services) bundle oneshot;
-  inherit (liminix.lib) typeChecked;
   inherit (lib) mkOption types;
-  t = {
-    members = mkOption {
-      type = types.listOf liminix.lib.types.service;
-      description = "interfaces to add to the bridge";
-    };
-    primary = mkOption {
-      type = liminix.lib.types.service;
-      description = "bridge interface to add them to";
-    };
-  };
-in
-params:
-let
-  inherit (typeChecked "bridge-members" t params) members primary;
   addif = member :
     oneshot {
       name = "add-${member.device}-to-br-${primary.device}";
diff --git a/modules/bridge/primary.nix b/modules/bridge/primary.nix
index 11ced24..2ebd92a 100644
--- a/modules/bridge/primary.nix
+++ b/modules/bridge/primary.nix
@@ -2,20 +2,11 @@
   liminix
 , lib
 }:
+{ ifname } :
 let
   inherit (liminix.networking) interface;
   inherit (liminix.lib) typeChecked;
   inherit (lib) mkOption types;
-  t = {
-    ifname = mkOption {
-      type = types.str;
-      description = "interface name for the bridge device";
-    };
-  };
-in
-params:
-let
-  inherit (typeChecked "bridge" t params) ifname;
 in interface {
   device = ifname;
   type = "bridge";