diff --git a/hosts/modules/server/ntfy-sh.nix b/hosts/modules/server/ntfy-sh.nix
index 728bb5e..f191147 100644
--- a/hosts/modules/server/ntfy-sh.nix
+++ b/hosts/modules/server/ntfy-sh.nix
@@ -9,7 +9,7 @@ in {
     enable = true;
     settings = {
       base-url = url;
-      listen-http = "${port}";
+      listen-http = "${toString port}";
       # auth-file = "/etc/ntfy-sh/authfile"
       auth-default-access = "deny-all";
       behind-proxy = true;