diff --git a/src/olympic/studio/modlib/include/studio/project.hpp b/src/olympic/studio/modlib/include/studio/project.hpp
index 9908889a..8efc7bb9 100644
--- a/src/olympic/studio/modlib/include/studio/project.hpp
+++ b/src/olympic/studio/modlib/include/studio/project.hpp
@@ -36,6 +36,15 @@ constexpr ox::Result<ox::StringView> fileExt(ox::CRStringView path) noexcept {
 	return substr(path, extStart + 1);
 }
 
+[[nodiscard]]
+constexpr ox::StringView parentDir(ox::StringView path) noexcept {
+	if (path.len() && path[path.len() - 1] == '/') {
+		path = substr(path, 0, path.len() - 1);
+	}
+	auto const extStart = ox::find(path.crbegin(), path.crend(), '/').offset();
+	return substr(path, 0, extStart);
+}
+
 class Project {
 	private:
 		keel::Context &m_ctx;
@@ -108,6 +117,7 @@ template<typename T>
 ox::Error Project::writeObj(ox::CRStringView path, T const&obj, ox::ClawFormat fmt) noexcept {
 	oxRequireM(buff, ox::writeClaw(obj, fmt));
 	// write to FS
+	oxReturnError(mkdir(parentDir(path)));
 	oxReturnError(writeBuff(path, buff));
 	// write type descriptor
 	if (m_typeStore.get<T>().error) {
diff --git a/src/olympic/studio/modlib/src/project.cpp b/src/olympic/studio/modlib/src/project.cpp
index cd0d2f5f..0a87fd75 100644
--- a/src/olympic/studio/modlib/src/project.cpp
+++ b/src/olympic/studio/modlib/src/project.cpp
@@ -13,6 +13,11 @@
 
 namespace studio {
 
+static_assert(fileExt("main.c").value == "c");
+static_assert(fileExt("a.b.c").value == "c");
+static_assert(parentDir("/a/b/c") == "/a/b");
+static_assert(parentDir("/a/b/c/") == "/a/b");
+
 static void generateTypes(ox::TypeStore &ts) noexcept {
 	for (auto const mod : keel::modules()) {
 		for (auto gen : mod->types()) {