diff --git a/src/Illuminate/Database/Eloquent/Relations/MorphPivot.php b/src/Illuminate/Database/Eloquent/Relations/MorphPivot.php
index ce36ea5c2fee..0db82ba101bc 100644
--- a/src/Illuminate/Database/Eloquent/Relations/MorphPivot.php
+++ b/src/Illuminate/Database/Eloquent/Relations/MorphPivot.php
@@ -45,6 +45,10 @@ protected function setKeysForSaveQuery(Builder $query)
      */
     public function delete()
     {
+        if (isset($this->attributes[$this->getKeyName()])) {
+            return (int) parent::delete();
+        }
+
         if ($this->fireModelEvent('deleting') === false) {
             return 0;
         }