1 files changed, 1 insertions, 1 deletions
diff --git a/warning.rb b/warning.rb
index 6e72ead1e2..f81ad77629 100644
--- a/warning.rb
+++ b/warning.rb
@@ -40,6 +40,6 @@ module Kernel
   #    baz.rb:6: warning: invalid call to foo
   #
   def warn(*msgs, uplevel: nil)
-    __builtin.rb_warn_m(msgs, uplevel)
+    Primitive.rb_warn_m(msgs, uplevel)
   end
 end