1 files changed, 2 insertions, 0 deletions
diff --git a/class.c b/class.c
index c997b0b172..8b0bfb8387 100644
--- a/class.c
+++ b/class.c
@@ -689,6 +689,8 @@ Init_class_hierarchy(void)
     RBASIC_SET_CLASS(rb_cObject, rb_cClass);
     RBASIC_SET_CLASS(rb_cRefinement, rb_cClass);
     RBASIC_SET_CLASS(rb_cBasicObject, rb_cClass);
+
+    ENSURE_EIGENCLASS(rb_cRefinement);
 }