diff --git a/src/Query/FunctionScoreQuery.php b/src/Query/FunctionScoreQuery.php
index 9e09a52a3dea7a3bf89c737526275a58c6be8c28..19522eda489bb4fe92c130361c5b24d2042dfbe9 100644
--- a/src/Query/FunctionScoreQuery.php
+++ b/src/Query/FunctionScoreQuery.php
@@ -81,7 +81,7 @@ class FunctionScoreQuery implements BuilderInterface
      *
      * @return $this
      */
-    public function addFieldValueFactorFunction($field, $factor, $modifier, BuilderInterface $filter = null)
+    public function addFieldValueFactorFunction($field, $factor, $modifier = 'none', BuilderInterface $filter = null)
     {
         $function = [
             'field_value_factor' => [