diff --git a/modules/onion-services.nix b/modules/onion-services.nix
index 52c6c2f..288e673 100644
--- a/modules/onion-services.nix
+++ b/modules/onion-services.nix
@@ -10,6 +10,7 @@ with lib;
 
 let
   cfg = config.nix-bitcoin.onionServices;
+  nbLib = config.nix-bitcoin.lib;
 
   services = builtins.attrNames cfg;
 
@@ -60,13 +61,10 @@ in {
           let
             service = config.services.${name};
             inherit (cfg.${name}) externalPort;
-          in {
-            map = [{
-              port = if externalPort != null then externalPort else service.port;
-              toPort = service.port;
-              toHost = if service.address == "0.0.0.0" then "127.0.0.1" else service.address;
-            }];
-            version = 3;
+          in nbLib.mkHiddenService {
+            port = if externalPort != null then externalPort else service.port;
+            toPort = service.port;
+            toHost = if service.address == "0.0.0.0" then "127.0.0.1" else service.address;
           }
         );
       };
diff --git a/modules/presets/secure-node.nix b/modules/presets/secure-node.nix
index a0472c4..cf09b60 100644
--- a/modules/presets/secure-node.nix
+++ b/modules/presets/secure-node.nix
@@ -4,13 +4,8 @@ with lib;
 
 let
   cfg = config.services;
-
+  nbLib = config.nix-bitcoin.lib;
   operatorName = config.nix-bitcoin.operator.name;
-
-  mkHiddenService = map: {
-    map = [ map ];
-    version = 3;
-  };
 in {
   imports = [
     ../modules.nix
@@ -30,7 +25,7 @@ in {
     ];
 
     # sshd
-    services.tor.hiddenServices.sshd = mkHiddenService { port = 22; };
+    services.tor.hiddenServices.sshd = nbLib.mkHiddenService { port = 22; };
     nix-bitcoin.onionAddresses.access.${operatorName} = [ "sshd" ];
 
     services.bitcoind = {
diff --git a/pkgs/lib.nix b/pkgs/lib.nix
index 75409bf..ab8bfb0 100644
--- a/pkgs/lib.nix
+++ b/pkgs/lib.nix
@@ -65,4 +65,9 @@ let self = {
     type = types.str;
     default = "exec";
   };
+
+  mkHiddenService = map: {
+    map = [ map ];
+    version = 3;
+  };
 }; in self