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-rw-r--r--class.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/class.c b/class.c
index 6c7dfa5c17..ce2ede5c2b 100644
--- a/class.c
+++ b/class.c
@@ -1591,7 +1591,9 @@ singleton_class_of(VALUE obj)
klass = RBASIC(obj)->klass;
if (!(FL_TEST(klass, FL_SINGLETON) &&
rb_ivar_get(klass, id_attached) == obj)) {
+ rb_serial_t serial = RCLASS_SERIAL(klass);
klass = rb_make_metaclass(obj, klass);
+ RCLASS_SERIAL(klass) = serial;
}
if (OBJ_TAINTED(obj)) {