diff --git a/exercises/concept/chess-game/chess_game.rb b/exercises/concept/chess-game/chess_game.rb
index 7cb14dea24..2f57a981f1 100644
--- a/exercises/concept/chess-game/chess_game.rb
+++ b/exercises/concept/chess-game/chess_game.rb
@@ -6,7 +6,7 @@ def self.valid_square?(rank, file)
     raise "Please implement the Chess.valid_square? method"
   end
 
-  def self.nick_name(first_name, last_name)
+  def self.nickname(first_name, last_name)
     raise "Please implement the Chess.nick_name method"
   end