diff --git a/lang/compile.py b/lang/compile.py
index 7aae44b..4e0b50e 100755
--- a/lang/compile.py
+++ b/lang/compile.py
@@ -1007,6 +1007,10 @@
 	%s{.name = NULL, /* end */ },
 };
 
+static ModuleClass CLASSNAME_module_class = {
+	.fields_count = 0,
+};
+
 static struct object_class CLASSNAME_class = {
 	.cleanup = CLASSNAME_cleanup,
 	.calls = &CLASSNAME_calls[0],
@@ -1022,18 +1026,27 @@
 
 def generate_metadata(node):
 	uses = ""
+	classes_ = ""
 	for use in node.uses:
 		uses += "\t\"%s\",\n" % (use)
+	for class_ in node.classes_:
+		name = class_.name
+		classes_ += "\t&%s_module_class,\n" % (name)
 	return """static const char* module_uses[] = {
 %s	NULL, /* end */
 };
 
+static ModuleClass *module_classes[] = {
+%s	NULL, /* end */
+};
+
 const ModuleInfo module_info_%s = {
 	.name = "%s",
 	.uses = module_uses,
+	.classes = module_classes,
 	.create = %s_create,
 };
-""" % (uses, node.id, node.name, node.name)
+""" % (uses, classes_, node.id, node.name, node.name)
 
 def generate_c_file(module_args, ir, source):
 	metadata = ""
diff --git a/lang/module.h b/lang/module.h
index 59841e5..a939f9c 100644
--- a/lang/module.h
+++ b/lang/module.h
@@ -20,10 +20,18 @@
 // the compiler's C code generator. Do not use for regular C code.
 #ifdef MODULE_INTERNAL_API
 
+// A class in a module
+struct module_class {
+	int fields_count;
+};
+
+typedef struct module_class ModuleClass;
+
 // Data structure for creating a module
 struct module_info {
 	const char *name;
 	const char **uses;
+	ModuleClass **classes;
 	Object (*create)(VmState state, Object use_modules);
 };