diff --git a/lib/differ/format/patch.rb b/lib/differ/format/patch.rb
index d9204cea..c021171e 100644
--- a/lib/differ/format/patch.rb
+++ b/lib/differ/format/patch.rb
@@ -28,7 +28,7 @@ module Differ
         end
 
         def as_change(change)
-          [as_delete(change), as_insert(change)].join '\n'
+          [as_delete(change), as_insert(change)].join "\n"
         end
       end
     end