1 files changed, 2 insertions, 0 deletions
diff --git a/ractor_pub.h b/ractor_pub.h
index 5347481429..f2869276f6 100644
--- a/ractor_pub.h
+++ b/ractor_pub.h
@@ -36,6 +36,8 @@ rb_ractor_shareable_p(VALUE obj)
     }
 }
 
+VALUE rb_ractor_make_shareable(VALUE obj);
+
 RUBY_SYMBOL_EXPORT_BEGIN
 
 VALUE rb_ractor_stdin(void);