1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index aa0d9e4b9d..f7838d6dfb 100644
--- a/intern.h
+++ b/intern.h
@@ -220,6 +220,7 @@ void rb_gc_mark_maybe _((VALUE));
 void rb_gc_mark _((VALUE));
 void rb_gc_force_recycle _((VALUE));
 void rb_gc _((void));
+void rb_gc_copy_finalizer _((VALUE,VALUE));
 void rb_gc_call_finalizer_at_exit _((void));
 VALUE rb_gc_enable _((void));
 VALUE rb_gc_disable _((void));