diff --git a/plugins/styles/corners/rounded_corners.inc b/plugins/styles/corners/rounded_corners.inc
index dd51170..a1d800b 100644
--- a/plugins/styles/corners/rounded_corners.inc
+++ b/plugins/styles/corners/rounded_corners.inc
@@ -125,7 +125,7 @@ function panels_rounded_corners_css($display) {
     $filename = ctools_css_store($css_id, _panels_rounded_corners_css($idstr), FALSE);
   }
 
-  drupal_add_css($filename, 'module', 'all', FALSE);
+  drupal_add_css($filename, array('preprocess' => TRUE));
 }
 
 /**