diff --git a/src/sngrl/SphinxSearch/SphinxSearch.php b/src/sngrl/SphinxSearch/SphinxSearch.php
index 87ff926..d6c0d01 100644
--- a/src/sngrl/SphinxSearch/SphinxSearch.php
+++ b/src/sngrl/SphinxSearch/SphinxSearch.php
@@ -114,9 +114,9 @@ public function setMatchMode($mode)
         return $this;
     }
 
-    public function setRankingMode($mode)
+    public function setRankingMode($mode, $rankexpr = '')
     {
-        $this->_connection->setRankingMode($mode);
+        $this->_connection->setRankingMode($mode, $rankexpr);
         return $this;
     }