1 files changed, 2 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index 90d4d68be4..fb065f5c47 100644
--- a/vm.c
+++ b/vm.c
@@ -1618,7 +1618,8 @@ static void
 rb_vm_check_redefinition_opt_method(const rb_method_entry_t *me, VALUE klass)
 {
     st_data_t bop;
-    if (RB_TYPE_P(klass, T_ICLASS) && FL_TEST(klass, RICLASS_IS_ORIGIN)) {
+    if (RB_TYPE_P(klass, T_ICLASS) && FL_TEST(klass, RICLASS_IS_ORIGIN) &&
+            RB_TYPE_P(RBASIC_CLASS(klass), T_CLASS)) {
        klass = RBASIC_CLASS(klass);
     }
     if (vm_redefinition_check_method_type(me->def)) {