diff --git a/lib/sanitizer.rb b/lib/sanitizer.rb
index 510d9341..58166936 100644
--- a/lib/sanitizer.rb
+++ b/lib/sanitizer.rb
@@ -48,7 +48,7 @@ module Sanitizer
       frame height linethickness lspace mathbackground mathcolor mathvariant
       maxsize minsize notation open other rowalign
       rowlines rowspacing rowspan rspace scriptlevel selection separator
-      separators stretchy width xlink:href xlink:show xlink:type xmlns
+      separators stretchy width voffset xlink:href xlink:show xlink:type xmlns
       xmlns:xlink]
 
   svg_attributes = Set.new %w[accent-height accumulate additive alphabetic