diff --git a/hosts/modules/server/ntfy-sh.nix b/hosts/modules/server/ntfy-sh.nix
index fa67d77..6c75ee5 100644
--- a/hosts/modules/server/ntfy-sh.nix
+++ b/hosts/modules/server/ntfy-sh.nix
@@ -3,7 +3,7 @@
 let
   hostname = "ntfy.anotherhadi.com";
   port = 8082;
-  url = "https://" + hostname + ":" + port;
+  url = "https://" + hostname + ":${toString port}";
 in {
   services.ntfy-sh = {
     enable = true;