diff --git a/action.js b/action.js
index d42ca18..b1d05f7 100644
--- a/action.js
+++ b/action.js
@@ -27,6 +27,9 @@ for (let modPy of readdirSync(".").filter((f) => f.slice(-3) == ".py")) {
   const modInitPath = `${modName}/__init__.mpy`;
   const modMpyPath = `${modName}/${modName}.mpy`;
 
+  // create mod dir
+  mkdirSync(`${libName}/${modName}`);
+
   // compile mpy file
   execSync(`pipx run mpy-cross ${modPy} -o ${libName}/${modMpyPath}`, {
     encoding: "utf8",