diff --git i/modules/filter/filter.module w/modules/filter/filter.module
index 49702fe..4a5d274 100644
--- i/modules/filter/filter.module
+++ w/modules/filter/filter.module
@@ -907,6 +907,7 @@ function _filter_autop($text) {
       // Passthrough comments.
       if (substr($chunk, 1, 3) == '!--') {
         $output .= $chunk;
+        continue;
       }
       else {
         // Opening or closing tag?