diff --git a/token_filter.module b/token_filter.module
index 8f613e3..27fe898 100644
--- a/token_filter.module
+++ b/token_filter.module
@@ -15,6 +15,7 @@ function token_filter_filter_info() {
     'process callback' => '_token_filter_filter_tokens',
     'tips callback' => '_token_filter_filter_tips',
     'cache' => FALSE,
+    'type' => FILTER_TYPE_TRANSFORM_REVERSIBLE,
   );
   return $filters;
 }