diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index bf094dbe984..625eb54403d 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -195,6 +195,7 @@ in
   keymap = handleTest ./keymap.nix {};
   knot = handleTest ./knot.nix {};
   krb5 = discoverTests (import ./krb5 {});
+  ksm = handleTest ./ksm.nix {};
   kubernetes.dns = handleTestOn ["x86_64-linux"] ./kubernetes/dns.nix {};
   # kubernetes.e2e should eventually replace kubernetes.rbac when it works
   #kubernetes.e2e = handleTestOn ["x86_64-linux"] ./kubernetes/e2e.nix {};
diff --git a/nixos/tests/ksm.nix b/nixos/tests/ksm.nix
new file mode 100644
index 00000000000..8feccbe6df5
--- /dev/null
+++ b/nixos/tests/ksm.nix
@@ -0,0 +1,22 @@
+import ./make-test-python.nix ({ pkgs, ...} :
+
+{
+  name = "ksm";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ rnhmjoj ];
+  };
+
+  machine = { ... }: {
+    imports = [ ../modules/profiles/minimal.nix ];
+
+    hardware.ksm.enable = true;
+    hardware.ksm.sleep = 300;
+  };
+
+  testScript =
+    ''
+      machine.start()
+      machine.wait_until_succeeds("test $(</sys/kernel/mm/ksm/run) -eq 1")
+      machine.wait_until_succeeds("test $(</sys/kernel/mm/ksm/sleep_millisecs) -eq 300")
+    '';
+})