diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..c1009ef
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,17 @@
+{ depot, pkgs, ... }:
+
+pkgs.rustPlatform.buildRustPackage {
+  name = "planet-mars";
+  src = depot.third_party.gitignoreSource ./.;
+  cargoLock.lockFile = ./Cargo.lock;
+
+  nativeBuildInputs = [ pkgs.pkg-config ];
+  buildInputs = [ pkgs.openssl ];
+
+  # planet-mars is mirrored to Github.
+  passthru.meta.ci.extraSteps.github = depot.tools.releases.filteredGitPush {
+    filter = ":/web/planet-mars";
+    remote = "git@github.com:thkoch2001/planet-mars.git";
+    ref = "refs/heads/master";
+  };
+}