diff --git a/pkgs/by-name/wi/witx-codegen/Cargo.lock b/pkgs/by-name/wi/witx-codegen/Cargo.lock
new file mode 100644
index 000000000000..3d63419d1dc0
--- /dev/null
+++ b/pkgs/by-name/wi/witx-codegen/Cargo.lock
@@ -0,0 +1,333 @@
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+# It is not intended for manual editing.
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+
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+dependencies = [
+ "anyhow",
+ "log",
+ "thiserror",
+ "wast",
+]
+
+[[package]]
+name = "witx-codegen"
+version = "0.11.4"
+dependencies = [
+ "anyhow",
+ "convert_case",
+ "structopt",
+ "strum",
+ "strum_macros",
+ "witnext",
+]
diff --git a/pkgs/by-name/wi/witx-codegen/package.nix b/pkgs/by-name/wi/witx-codegen/package.nix
new file mode 100644
index 000000000000..2f64e64756c9
--- /dev/null
+++ b/pkgs/by-name/wi/witx-codegen/package.nix
@@ -0,0 +1,39 @@
+{
+  lib,
+  fetchFromGitHub,
+  nix-update-script,
+  rustPlatform,
+  versionCheckHook,
+}:
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "witx-codegen";
+  version = "0.11.4";
+  __structuredAttrs = true;
+
+  src = fetchFromGitHub {
+    owner = "jedisct1";
+    repo = "witx-codegen";
+    tag = finalAttrs.version;
+    hash = "sha256-/Zi7iQ2NSy0eGLyAQBp/PiKQEAp33OSW9MkXawQuLMA=";
+  };
+
+  # Upstream does not provide a Cargo.lock file
+  cargoLock.lockFile = ./Cargo.lock;
+  postPatch = ''
+    ln -s ${./Cargo.lock} Cargo.lock
+  '';
+
+  doInstallCheck = true;
+  nativeInstallCheckInputs = [ versionCheckHook ];
+
+  passthru.updateScript = nix-update-script { };
+
+  meta = {
+    description = "WITX code and documentation generator for AssemblyScript, Zig, Rust and more";
+    homepage = "https://github.com/jedisct1/witx-codegen";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.zebreus ];
+    mainProgram = "witx-codegen";
+    platforms = lib.platforms.all;
+  };
+})