diff --git a/hosts/niks/configuration.nix b/hosts/niks/configuration.nix
index 1c7b84f0..cb9d6b97 100644
--- a/hosts/niks/configuration.nix
+++ b/hosts/niks/configuration.nix
@@ -88,6 +88,7 @@
             ];
             max-jobs = 3;
             cores = 4;
+            auto-optimise-store = true;
             substituters = [
                 "https://nix-gaming.cachix.org"
                 "https://nix-community.cachix.org"