diff --git a/nixos/tests/miniflux.nix b/nixos/tests/miniflux.nix
index b7c2ec8f38b0..87415eeff7c7 100644
--- a/nixos/tests/miniflux.nix
+++ b/nixos/tests/miniflux.nix
@@ -81,7 +81,7 @@ in
           '';
         };
         systemd.services.postgresql-setup.postStart = lib.mkAfter ''
-          $PSQL -tAd miniflux -c 'CREATE EXTENSION hstore;'
+          psql -tAd miniflux -c 'CREATE EXTENSION hstore;'
         '';
         networking.firewall.allowedTCPPorts = [ config.services.postgresql.settings.port ];
       };