diff --git a/mrbgems/mruby-array-ext/mrblib/array.rb b/mrbgems/mruby-array-ext/mrblib/array.rb
index 29a433341..ea8de8a81 100644
--- a/mrbgems/mruby-array-ext/mrblib/array.rb
+++ b/mrbgems/mruby-array-ext/mrblib/array.rb
@@ -545,7 +545,7 @@ class Array
     end
 
     Array.new(column_count) do |column_index|
-      self.map { |row| row[column_index] }
+      self.map {|row| row[column_index] }
     end
   end