diff --git a/date_popup/date_popup.module b/date_popup/date_popup.module
index a03132e9..ab7d205c 100644
--- a/date_popup/date_popup.module
+++ b/date_popup/date_popup.module
@@ -672,6 +672,7 @@ function date_popup_formats() {
   }
 
   $formats = str_replace('i', 'i:s', array_keys($formats));
+  $formats = str_replace('S', '', $formats);
   $formats = drupal_map_assoc($formats);
 
   return $formats;