diff --git a/modules/server/database/default.nix b/modules/server/database/default.nix
index 99de6ce..70f0e98 100644
--- a/modules/server/database/default.nix
+++ b/modules/server/database/default.nix
@@ -24,6 +24,7 @@ in {
     };
 
     systemd.services.postgresql.postStart = lib.mkAfter ''
+      PSQL="${pkgs.postgresql}/bin/psql"
       ${lib.concatMapStringsSep "\n" (name: ''
         $PSQL -tAc "ALTER DATABASE ${name}_db OWNER TO ${name}_user;"