diff --git a/hosts/bemmer/configuration.nix b/hosts/bemmer/configuration.nix
index ebe53b2..e7d0951 100644
--- a/hosts/bemmer/configuration.nix
+++ b/hosts/bemmer/configuration.nix
@@ -30,6 +30,7 @@
 
   nixpkgs.system = "aarch64-linux";
   hardware.raspberry-pi."4".fkms-3d.enable = true;
+  boot.tmpOnTmpfs = true; # building stuff on sd-card is slow
 
   system.stateVersion = "21.05";
 }