diff --git a/modules/filter/filter.module b/modules/filter/filter.module
index 7efbe35..5a8007a 100644
--- a/modules/filter/filter.module
+++ b/modules/filter/filter.module
@@ -457,9 +457,8 @@ function check_markup($text, $format = FILTER_FORMAT_DEFAULT, $check = TRUE) {
       $text = module_invoke($filter->module, 'filter', 'process', $filter->delta, $format, $text, $cache_id);
     }
 
-    // Store in cache with a minimum expiration time of 1 day.
     if ($cache) {
-      cache_set($cache_id, $text, 'cache_filter', time() + (60 * 60 * 24));
+      cache_set($cache_id, $text, 'cache_filter');
     }
   }
   else {