diff --git a/service.inc b/service.inc
index 9d81221..1168d91 100644
--- a/service.inc
+++ b/service.inc
@@ -341,6 +341,7 @@ class SearchApiSolrService extends SearchApiAbstractService {
         'search_api_id' => 'ss_search_api_id',
         'search_api_relevance' => 'score',
         'search_api_item_id' => 'item_id',
+        'search_api_random' => 'random_' . rand(1, 200),
       );
 
       // Add the names of any "fields" configured on the index.