diff --git a/tests/installer.nix b/tests/installer.nix
index 2b3232ca353..88ad79ae0ee 100644
--- a/tests/installer.nix
+++ b/tests/installer.nix
@@ -22,6 +22,7 @@ let
               [ pkgs.glibcLocales
                 pkgs.sudo
                 pkgs.docbook5
+                pkgs.docbook5_xsl
                 pkgs.grub
               ];
           }