diff --git a/flake.nix b/flake.nix
index ce8a99b..25b34be 100644
--- a/flake.nix
+++ b/flake.nix
@@ -104,7 +104,7 @@
                   # Base.encode32(:crypto.strong_rand_bytes(32))
                   PORT = "${toString cfg.phx.port}";
                   PHX_HOST = cfg.domain;
-                  PHX_SERVER = cfg.phx.enableServer;
+                  PHX_SERVER = toString cfg.phx.enableServer;
                 };
                 serviceConfig = {
                   Type = "exec";