diff --git a/cleanpager.module b/cleanpager.module
index 83cff30..4a3d420 100644
--- a/cleanpager.module
+++ b/cleanpager.module
@@ -372,7 +372,7 @@ function _cleanpager_is_array_theme($themes, $theme_key) {
  */
 function cleanpager_theme_registry_alter(&$theme_registry) {
   // Kill the next/previous forum topic navigation links.
-  if (isset($theme_registry['pager_link']['function']['theme_pager_link'])) {
+  if ($theme_registry['pager_link']['function'] == 'theme_pager_link') {
     $theme_registry['pager_link']['function'] = 'cleanpager_theme_pager_link';
   }
 }