diff --git a/Solr_Base_Query.php b/Solr_Base_Query.php
index d6837a6..9325b61 100644
--- a/Solr_Base_Query.php
+++ b/Solr_Base_Query.php
@@ -482,6 +482,10 @@ class SolrBaseQuery extends SolrFilterSubQuery implements DrupalSolrQueryInterfa
       }
       $queryvalues['solrsort'] = $solrsort['#name'] .' '. $solrsort['#direction'];
     }
+    else {
+      // Return to default relevancy sort.
+      unset($queryvalues['solrsort']);
+    }
     return $queryvalues;
   }