diff --git a/rubberin b/rubberin
index f9f1390..120b3c5 100755
--- a/rubberin
+++ b/rubberin
@@ -128,8 +128,10 @@ opts.each do |opt, _arg|
   when "--ps"
     mode = :ps
   when "--pdf"
-    mode = if mode == :ps then :pspdf
-           else :pdf
+    mode = if mode == :ps
+             :pspdf
+           else
+             :pdf
            end
   when "--version"
     puts "#{PROGRAM} #{VERSION}"