diff --git a/mrbgems/mruby-string-ext/mrblib/string.rb b/mrbgems/mruby-string-ext/mrblib/string.rb
index 9f940ca32..b6e189aae 100644
--- a/mrbgems/mruby-string-ext/mrblib/string.rb
+++ b/mrbgems/mruby-string-ext/mrblib/string.rb
@@ -439,6 +439,8 @@ class String
     self
   end
 
+  alias append_as_bytes concat
+
   def __upto_endless(&block)
     len = self.length
     # both edges are all digits