diff --git a/search_queries_query_string.go b/search_queries_query_string.go
index <HASH>..<HASH> 100644
--- a/search_queries_query_string.go
+++ b/search_queries_query_string.go
@@ -201,6 +201,10 @@ func (q QueryStringQuery) Source() interface{} {
 		query["tie_breaker"] = *q.tieBreaker
 	}
 
+	if q.useDisMax != nil {
+		query["use_dis_max"] = *q.useDisMax
+	}
+
 	if q.defaultOper != "" {
 		query["default_operator"] = q.defaultOper
 	}
Forgot that use_dis_max