--- geshifilter.pages_orig.inc	2008-05-01 22:26:14.000000000 +0200
+++ geshifilter.pages.inc	2009-01-13 16:54:44.000000000 +0100
@@ -220,7 +220,7 @@ function _geshifilter_replace_callback($
   $complete_match = $match[0];
   $tag_name = $match[1];
   $tag_attributes = $match[2];
-  $source_code = $match[3];
+  $source_code = strip_tags(decode_entities($match[3]));
 
   // Undo linebreak and escaping from preparation phase.
   $source_code = decode_entities($source_code);