diff --git a/modules/clan/phonebox/default.nix b/modules/clan/phonebox/default.nix
index 37780b1..7b8c4b7 100644
--- a/modules/clan/phonebox/default.nix
+++ b/modules/clan/phonebox/default.nix
@@ -242,7 +242,7 @@
                       serverConf = builtins.foldl' (
                         config: node:
                         config
-                        ++ (genExtentConf {
+                        + (genExtentConf {
                           prefixNumber = node.prefixNumber;
                           hostname = node.hostname;
                         })
@@ -271,7 +271,7 @@
                       serverConf = builtins.foldl' (
                         conf: node:
                         conf
-                        ++ (genServerSIPEndpoint {
+                        + (genServerSIPEndpoint {
                           hostname = node.hostname;
                           address = node.address;
                         })