1 files changed, 2 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index 061a8d5f31..8c60e5d80a 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1323,7 +1323,8 @@ r_entry0(VALUE v, st_index_t num, struct load_arg *arg)
     else {
         st_insert(arg->data, num, (st_data_t)v);
     }
-    if (arg->infection) {
+    if (arg->infection &&
+	TYPE(v) != T_CLASS && TYPE(v) != T_MODULE) {
 	FL_SET(v, arg->infection);
 	if ((VALUE)real_obj != Qundef)
 	    FL_SET((VALUE)real_obj, arg->infection);