diff --git a/mrbgems/mruby-hash-ext/mrblib/hash.rb b/mrbgems/mruby-hash-ext/mrblib/hash.rb
index 7bf06a0ad..d1a709325 100644
--- a/mrbgems/mruby-hash-ext/mrblib/hash.rb
+++ b/mrbgems/mruby-hash-ext/mrblib/hash.rb
@@ -475,6 +475,10 @@ class Hash
     self
   end
 
+  def to_proc
+    ->x{self[x]}
+  end
+
   ##
   # call-seq:
   #   hsh.fetch_values(key, ...)                 -> array