diff --git a/src/Illuminate/Database/Eloquent/Builder.php b/src/Illuminate/Database/Eloquent/Builder.php
index a7306ad15d03..7cbe32e9ad1c 100755
--- a/src/Illuminate/Database/Eloquent/Builder.php
+++ b/src/Illuminate/Database/Eloquent/Builder.php
@@ -7,6 +7,7 @@
 use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 use Illuminate\Pagination\Paginator;
+use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Pagination\LengthAwarePaginator;
 use Illuminate\Database\Eloquent\Relations\Relation;
 use Illuminate\Database\Query\Builder as QueryBuilder;
@@ -190,7 +191,7 @@ public function when($value, $callback, $default = null)
      */
     public function whereKey($id)
     {
-        if (is_array($id)) {
+        if (is_array($id) || $id instanceof Arrayable) {
             $this->query->whereIn($this->model->getQualifiedKeyName(), $id);
 
             return $this;
diff --git a/tests/Database/DatabaseEloquentBuilderTest.php b/tests/Database/DatabaseEloquentBuilderTest.php
index 86d613e8ca3a..1bee8ba62d8f 100755
--- a/tests/Database/DatabaseEloquentBuilderTest.php
+++ b/tests/Database/DatabaseEloquentBuilderTest.php
@@ -805,6 +805,45 @@ public function testSelfHasNestedUsesAlias()
         $this->assertContains('"self_alias_hash"."id" = "self_related_stubs"."parent_id"', $sql);
     }
 
+    public function testWhereKeyMethodWithInt()
+    {
+        $model = $this->getMockModel();
+        $builder = $this->getBuilder()->setModel($model);
+        $keyName = $model->getQualifiedKeyName();
+
+        $int = 1;
+
+        $builder->getQuery()->shouldReceive('where')->once()->with($keyName, '=', $int);
+
+        $builder->whereKey($int);
+    }
+
+    public function testWhereKeyMethodWithArray()
+    {
+        $model = $this->getMockModel();
+        $builder = $this->getBuilder()->setModel($model);
+        $keyName = $model->getQualifiedKeyName();
+
+        $array = [1, 2, 3];
+
+        $builder->getQuery()->shouldReceive('whereIn')->once()->with($keyName, $array);
+
+        $builder->whereKey($array);
+    }
+
+    public function testWhereKeyMethodWithCollection()
+    {
+        $model = $this->getMockModel();
+        $builder = $this->getBuilder()->setModel($model);
+        $keyName = $model->getQualifiedKeyName();
+
+        $collection = new Collection([1, 2, 3]);
+
+        $builder->getQuery()->shouldReceive('whereIn')->once()->with($keyName, $collection);
+
+        $builder->whereKey($collection);
+    }
+
     protected function mockConnectionForModel($model, $database)
     {
         $grammarClass = 'Illuminate\Database\Query\Grammars\\'.$database.'Grammar';