diff --git a/modules/filter/filter.module b/modules/filter/filter.module
index 6ea0537..e059685 100644
--- a/modules/filter/filter.module
+++ b/modules/filter/filter.module
@@ -429,15 +429,15 @@ function check_markup($text, $format = FILTER_FORMAT_DEFAULT, $check = TRUE) {
   if (isset($text) && (!$check || filter_access($format))) {
     $format = filter_resolve_format($format);
 
+    // See if caching is allowed for this format.
+    $cache = filter_format_allowcache($format);
+
     // Check for a cached version of this piece of text.
     $cache_id = $format .':'. md5($text);
-    if ($cached = cache_get($cache_id, 'cache_filter')) {
+    if ($cache && $cached = cache_get($cache_id, 'cache_filter')) {
       return $cached->data;
     }
 
-    // See if caching is allowed for this format.
-    $cache = filter_format_allowcache($format);
-
     // Convert all Windows and Mac newlines to a single newline,
     // so filters only need to deal with one possibility.
     $text = str_replace(array("\r\n", "\r"), "\n", $text);