diff --git a/base.nix b/base.nix
index 0cf9acb..a373332 100644
--- a/base.nix
+++ b/base.nix
@@ -47,6 +47,10 @@
   nix.gc.automatic = true;
   nix.gc.dates     = "weekly";
   nix.gc.options   = "--delete-older-than 30d";
+  nix.extraOptions = ''
+    min-free = ${toString (1 * 1024 * 1024 * 1024)}
+    max-free = ${toString (5 * 1024 * 1024 * 1024)}
+  '';
 
   services.thermald.enable = lib.mkIf (config.nixpkgs.system == "x86_64-linux") true;