diff --git a/src/Plugin/search_api/backend/SearchApiSolrBackend.php b/src/Plugin/search_api/backend/SearchApiSolrBackend.php
index 465f649..16f93ea 100644
--- a/src/Plugin/search_api/backend/SearchApiSolrBackend.php
+++ b/src/Plugin/search_api/backend/SearchApiSolrBackend.php
@@ -423,6 +423,7 @@ class SearchApiSolrBackend extends BackendPluginBase {
       //'search_api_facets_operator_or',
       //'search_api_grouping',
       'search_api_mlt',
+      'search_api_random_sort',
       'search_api_spellcheck',
       //'search_api_data_type_location',
       //'search_api_data_type_geohash',
@@ -980,6 +981,7 @@ class SearchApiSolrBackend extends BackendPluginBase {
       $ret = array(
         'search_api_id' => 'item_id',
         'search_api_relevance' => 'score',
+        'search_api_random' => 'random',
       );
 
       // Add the names of any fields configured on the index.
diff --git a/src/Solr/SolrHelper.php b/src/Solr/SolrHelper.php
index 32892d4..79b79f5 100644
--- a/src/Solr/SolrHelper.php
+++ b/src/Solr/SolrHelper.php
@@ -480,10 +480,23 @@ class SolrHelper {
 
   public function setSorts(Query $solarium_query, QueryInterface $query, $field_names_single_value = array()) {
     foreach ($query->getSorts() as $field => $order) {
-      $f = $field_names_single_value[$field];
-      if (substr($f, 0, 3) == 'ss_') {
-        $f = 'sort_' . substr($f, 3);
+      // The default Solr schema provides a virtual field named "random_SEED"
+      // that can be used to randomly sort the results; the field is available
+      // only at query-time.
+      if ($field == 'search_api_random') {
+        $params = $query->getOption('search_api_random_sort', array());
+        // Random seed: getting the value from parameters or computing a new
+        // one.
+        $seed = !empty($params['seed']) ? $params['seed'] : mt_rand();
+        $f = 'random_' . $seed;
       }
+      else {
+        $f = $field_names_single_value[$field];
+        if (substr($f, 0, 3) == 'ss_') {
+          $f = 'sort_' . substr($f, 3);
+        }
+      }
+
       $solarium_query->addSort($f, strtolower($order));
     }
   }