diff --git a/lib/thor/shell/basic.rb b/lib/thor/shell/basic.rb
index ed943f8c9..ca971cb22 100644
--- a/lib/thor/shell/basic.rb
+++ b/lib/thor/shell/basic.rb
@@ -467,7 +467,7 @@ def answer_match(possibilities, answer, case_insensitive)
           possibilities.detect{ |possibility| possibility.downcase == answer.downcase }
         else
           possibilities.detect{ |possibility| possibility == answer }
-        end 
+        end
       end
 
       def merge(destination, content) #:nodoc: