diff --git a/nixos/modules/services/misc/n8n.nix b/nixos/modules/services/misc/n8n.nix
index c72ed106f2d9..2af37fba910a 100644
--- a/nixos/modules/services/misc/n8n.nix
+++ b/nixos/modules/services/misc/n8n.nix
@@ -27,7 +27,7 @@ in
     };
 
     webhookUrl = mkOption {
-      type = types.string;
+      type = types.str;
       default = "";
       description = lib.mdDoc ''
         WEBHOOK_URL for n8n, in case we're running behind a reverse proxy.
@@ -53,7 +53,7 @@ in
         N8N_USER_FOLDER = "/var/lib/n8n";
         HOME = "/var/lib/n8n";
         N8N_CONFIG_FILES = "${configFile}";
-        WEBHOOK_URL = "${webhookUrl}";
+        WEBHOOK_URL = "${cfg.webhookUrl}";
 
         # Don't phone home
         N8N_DIAGNOSTICS_ENABLED = "false";