diff --git a/lib/v8/util/weakcell.rb b/lib/v8/util/weakcell.rb
index bc0e9c6..7562238 100644
--- a/lib/v8/util/weakcell.rb
+++ b/lib/v8/util/weakcell.rb
@@ -15,7 +15,7 @@ module V8
           else
             populate(block)
           end
-        rescue RefError
+        rescue WeakRef::RefError
           populate(block)
         end