diff --git a/src/Prettus/Repository/Contracts/RepositoryInterface.php b/src/Prettus/Repository/Contracts/RepositoryInterface.php
index 7951d36d..479211c3 100644
--- a/src/Prettus/Repository/Contracts/RepositoryInterface.php
+++ b/src/Prettus/Repository/Contracts/RepositoryInterface.php
@@ -31,11 +31,13 @@ public function pluck($column, $key = null);
     /**
      * Sync relations
      *
+     * @param $id
      * @param $relation
      * @param array $attributes
-     * @return $this
+     * @param boolean $detaching
+     * @return array
      */
-    public function sync($relation, $attributes);
+    public function sync($id, $relation, $attributes, $detaching = true);
 
     /**
      * Retrieve all data of repository
diff --git a/src/Prettus/Repository/Eloquent/BaseRepository.php b/src/Prettus/Repository/Eloquent/BaseRepository.php
index 1ce572c5..140e2c33 100644
--- a/src/Prettus/Repository/Eloquent/BaseRepository.php
+++ b/src/Prettus/Repository/Eloquent/BaseRepository.php
@@ -285,14 +285,15 @@ public function pluck($column, $key = null)
     /**
      * Sync relations
      *
+     * @param $id
      * @param $relation
      * @param array $attributes
-     * @return $this
+     * @param boolean $detaching
+     * @return array
      */
-    public function sync($relation, $attributes)
+    public function sync($id, $relation, $attributes, $detaching = true)
     {
-        $this->model = $this->model->with($relation)->getRelation($relation)->sync($attributes);
-        return $this;
+        return $this->find($id)->getRelation($relation)->sync($attributes, $detaching);
     }
 
     /**