diff --git a/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix b/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix
index abf0a5186b6a..7a3bd74cb70a 100644
--- a/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix
+++ b/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix
@@ -9,6 +9,9 @@
     ./installation-cd-base.nix
   ];
 
+  # Causes a lot of uncached builds for a negligible decrease in size.
+  environment.noXlibs = lib.mkOverride 500 false;
+
   documentation.man.enable = lib.mkOverride 500 true;
 
   fonts.fontconfig.enable = lib.mkForce false;