diff --git a/lang/module.c b/lang/module.c
index dc387f9..ec5729a 100644
--- a/lang/module.c
+++ b/lang/module.c
@@ -55,6 +55,8 @@
 	static struct module_stack traversing = {0};
 	if (sizeof(modules_list) > sizeof(traversing.elems))
 		abort_print("Modules too big to traverse");
+	if (in_stack(start, visited))
+		return;
 	traversing.next = 0;
 	traversing.elems[traversing.next++] = start;
 	do {