diff --git a/Library/Homebrew/cask/dsl/conflicts_with.rb b/Library/Homebrew/cask/dsl/conflicts_with.rb
index f2945d6b99..ea4065e21d 100644
--- a/Library/Homebrew/cask/dsl/conflicts_with.rb
+++ b/Library/Homebrew/cask/dsl/conflicts_with.rb
@@ -25,8 +25,9 @@ module Cask
           instance_variable_set("@#{key}", instance_variable_get("@#{key}").merge([*value]))
         end
       end
+
       def to_a
-        (@pairs.values)
+        @pairs.values
       end
     end
   end