diff --git a/src/ElasticquentTrait.php b/src/ElasticquentTrait.php
index 539cb96..8e2d56c 100644
--- a/src/ElasticquentTrait.php
+++ b/src/ElasticquentTrait.php
@@ -248,7 +248,11 @@ public static function searchByQuery($query = null, $aggregations = null, $sourc
         $params = $instance->getBasicEsParams(true, true, true, $limit, $offset);
 
         if ($sourceFields) {
-            $params['body']['_source']['include'] = $sourceFields;
+            if( isset($sourceFields['include']) || isset($sourceFields['exclude']) ) {
+                $params['body']['_source'] = $sourceFields;
+            }else{
+                $params['body']['_source']['include'] = $sourceFields;
+            }            
         }
 
         if ($query) {
@@ -558,4 +562,4 @@ public function newFromHitBuilder($hit = array())
 
         return $instance;
     }
-}
\ No newline at end of file
+}