Consider modified modules initialized [Bug #18185]

1 files changed, 3 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 60387f6e06..880c63b88f 100644
--- a/eval.c
+++ b/eval.c
@@ -424,6 +424,9 @@ rb_class_modify_check(VALUE klass)
     if (SPECIAL_CONST_P(klass)) {
 	Check_Type(klass, T_CLASS);
     }
+    if (RB_TYPE_P(klass, T_MODULE)) {
+        rb_module_set_initialized(klass);
+    }
     if (OBJ_FROZEN(klass)) {
 	const char *desc;