diff --git a/hosts/tankstelle/configuration.nix b/hosts/tankstelle/configuration.nix
index 2b1a177..3993544 100644
--- a/hosts/tankstelle/configuration.nix
+++ b/hosts/tankstelle/configuration.nix
@@ -10,6 +10,9 @@
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
+  # kernel same-page merging
+  hardware.ksm.enable = true;
+
   boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
 
   system.stateVersion = "23.11";