diff --git a/default.nix b/default.nix
index 0e39100..cb10ddc 100644
--- a/default.nix
+++ b/default.nix
@@ -33,12 +33,12 @@
     meta.mainProgram = pname;
   };
   script = pkgs.writeShellScriptBin pname ''
-    set -eu
+    set -e
     ${pkgs.coreutils}/bin/mkdir -p $FRAJTANO_DIR
     file="$FRAJTANO_DIR/cookie"
     (umask 077; [ -f "$file" ] || ${pkgs.coreutils}/bin/head -c 128 /dev/urandom | ${pkgs.coreutils}/bin/base64 -w0 > "$file")
     export RELEASE_COOKIE=$(${pkgs.coreutils}/bin/cat "$file")
-    [ -n $RELEASE_NODE ] || export RELEASE_NODE="frajtano-$(${pkgs.coreutils}/bin/whoami)@$(${pkgs.coreutils}/bin/cat /etc/hostname)"
+    [ -z $RELEASE_NODE ] && export RELEASE_NODE="frajtano-$(${pkgs.coreutils}/bin/whoami)@$(${pkgs.coreutils}/bin/cat /etc/hostname)"
     run() {
       exec ${lib.getExe pkg} "$@"
     }