diff --git a/flake.nix b/flake.nix
index f5cc238..b19e1de 100644
--- a/flake.nix
+++ b/flake.nix
@@ -82,7 +82,7 @@
               services.nginx.virtualHosts.${cfg.domain} = {
                 forceSSL = cfg.ssl;
                 enableACME = cfg.ssl;
-                locations."/".proxyPass = "http://127.0.0.1:${cfg.phx.port}";
+                locations."/".proxyPass = "http://127.0.0.1:${toString cfg.phx.port}";
               };
 
               systemd.services."zoeyscomputer-phx" = let
@@ -102,7 +102,7 @@
                   RELEASE_TMP = working_directory;
                   # can be generated in an elixir console with
                   # Base.encode32(:crypto.strong_rand_bytes(32))
-                  PORT = "${cfg.phx.port}";
+                  PORT = "${toString cfg.phx.port}";
                   PHX_HOST = cfg.domain;
                   PHX_SERVER = cfg.phx.enableServer;
                 };