diff --git a/flake.nix b/flake.nix
index bec7d31..a26adc5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -73,8 +73,8 @@
           enable = true;
           config = {
             EnvironmentVariables = {
-              FRAJTANO_DIR = cfg.dir;
-              FRAJTANO_CONFIG = configFile;
+              FRAJTANO_DIR = "${cfg.dir}";
+              FRAJTANO_CONFIG = "${configFile}";
             };
             ProgramArguments = ["${self.packages.${pkgs.system}.default}/bin/frajtano" "start"];
             RunAtLoad = true;