diff --git a/nixos/modules/hardware/ksm.nix b/nixos/modules/hardware/ksm.nix
new file mode 100644
index 00000000000..d6ac69b5d65
--- /dev/null
+++ b/nixos/modules/hardware/ksm.nix
@@ -0,0 +1,18 @@
+{ config, lib, ... }:
+
+{
+  options.hardware.enableKSM = lib.mkEnableOption "Kernel Same-Page Merging";
+
+  config = lib.mkIf config.hardware.enableKSM {
+    systemd.services.enable-ksm = {
+      description = "Enable Kernel Same-Page Merging";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "systemd-udev-settle.service" ];
+      script = ''
+        if [ -e /sys/kernel/mm/ksm ]; then
+          echo 1 > /sys/kernel/mm/ksm/run
+        fi
+      '';
+    };
+  };
+}
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 738faa79e29..33830dbc810 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -29,6 +29,7 @@
   ./hardware/all-firmware.nix
   ./hardware/cpu/amd-microcode.nix
   ./hardware/cpu/intel-microcode.nix
+  ./hardware/ksm.nix
   ./hardware/network/b43.nix
   ./hardware/network/intel-2100bg.nix
   ./hardware/network/intel-2200bg.nix