1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index d3db0a6104..1018d0bd30 100644
--- a/internal.h
+++ b/internal.h
@@ -969,6 +969,7 @@ rb_float_new_inline(double d)
 void rb_obj_copy_ivar(VALUE dest, VALUE obj);
 VALUE rb_obj_equal(VALUE obj1, VALUE obj2);
 VALUE rb_class_search_ancestor(VALUE klass, VALUE super);
+NORETURN(void rb_undefined_alloc(VALUE klass));
 double rb_num_to_dbl(VALUE val);
 VALUE rb_obj_dig(int argc, VALUE *argv, VALUE self, VALUE notfound);