1 files changed, 1 insertions, 1 deletions
diff --git a/object.c b/object.c
index 3de93c4f0e..fbd2f5d557 100644
--- a/object.c
+++ b/object.c
@@ -339,7 +339,7 @@ rb_obj_copy_ivar(VALUE dest, VALUE obj)
     shape_id_t dest_shape_id = src_shape_id;
     shape_id_t initial_shape_id = RBASIC_SHAPE_ID(dest);
 
-    RUBY_ASSERT(RSHAPE(initial_shape_id)->type == SHAPE_T_OBJECT);
+    RUBY_ASSERT(RSHAPE(initial_shape_id)->type == SHAPE_ROOT);
 
     dest_shape_id = rb_shape_rebuild(initial_shape_id, src_shape_id);
     if (UNLIKELY(rb_shape_too_complex_p(dest_shape_id))) {