diff --git a/ckeditor.module b/ckeditor.module
index ab868ee..c9f272a 100644
--- a/ckeditor.module
+++ b/ckeditor.module
@@ -234,7 +234,7 @@ function ckeditor_get_version($main_version = FALSE) {
  * Implementation of hook_init().
  */
 function ckeditor_init() {
-  drupal_add_css(drupal_get_path('module', 'ckeditor') . '/ckeditor.css');
+  drupal_add_css(drupal_get_path('module', 'ckeditor') . '/ckeditor.css', array('preprocess' => TRUE));
 }
 
 /**