diff --git a/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb b/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
index 22df33afbe..b950e84628 100644
--- a/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
+++ b/actionpack/lib/action_controller/vendor/html-scanner/html/tokenizer.rb
@@ -58,9 +58,6 @@ module HTML #:nodoc:
         elsif @scanner.scan(/!/) # doctype
           tag << @scanner.matched
           tag << consume_quoted_regions
-        elsif @scanner.scan(/\?/) # processing instructions, drop them
-          tag = ''
-          @scanner.scan_until(/\/>/)
         else
           tag << consume_quoted_regions
         end