diff --git a/lang/module.c b/lang/module.c
index 15eafb2..985fe2f 100644
--- a/lang/module.c
+++ b/lang/module.c
@@ -12,13 +12,13 @@
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 
 // Use X macros to declare external module variables
-#define X(id) extern ModuleInfo module_info_##id;
+#define X(id) extern const ModuleInfo module_info_##id;
 #include <module_ids.x>
 #undef X
 
 // Use X macros to build a list of modules
 #define X(id) &module_info_##id,
-static ModuleInfo *modules_list[] = {
+static const ModuleInfo *modules_list[] = {
 #include <module_ids.x>
 };
 #undef X
@@ -151,7 +151,7 @@
 	struct module_stack *infos = &mapping->infos;
 	struct object_stack *objs = &mapping->objects;
 	for (int i = objs->next; i < infos->next; ++i) {
-		ModuleInfo *info = infos->elems[i];
+		const ModuleInfo *info = infos->elems[i];
 		Object module = create_module(state, mapping, info);
 		objs->elems[objs->next++] = module;
 	}
diff --git a/lang/module.h b/lang/module.h
index 77f9599..1c9b588 100644
--- a/lang/module.h
+++ b/lang/module.h
@@ -26,7 +26,7 @@
 	Object (*create)(VmState state, Object *use_modules);
 };
 
-typedef const struct module_info ModuleInfo;
+typedef struct module_info ModuleInfo;
 
 #endif