diff --git a/src/BulkWriteResult.php b/src/BulkWriteResult.php
index 2862a59cd..15117bdb6 100644
--- a/src/BulkWriteResult.php
+++ b/src/BulkWriteResult.php
@@ -2,7 +2,7 @@
 
 namespace MongoDB;
 
-use BSON\ObjectId;
+use MongoDB\BSON\ObjectId;
 use MongoDB\Driver\WriteResult;
 
 /**
diff --git a/src/Model/IndexInput.php b/src/Model/IndexInput.php
index db4288992..3f55a3544 100644
--- a/src/Model/IndexInput.php
+++ b/src/Model/IndexInput.php
@@ -2,7 +2,7 @@
 
 namespace MongoDB\Model;
 
-use BSON\Serializable;
+use MongoDB\BSON\Serializable;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedTypeException;
 
diff --git a/tests/Collection/BulkWriteFunctionalTest.php b/tests/Collection/BulkWriteFunctionalTest.php
index 29a80f644..947768e0d 100644
--- a/tests/Collection/BulkWriteFunctionalTest.php
+++ b/tests/Collection/BulkWriteFunctionalTest.php
@@ -28,7 +28,7 @@ public function testInserts()
 
         $insertedIds = $result->getInsertedIds();
         $this->assertSame(1, $insertedIds[0]);
-        $this->assertInstanceOf('BSON\ObjectId', $insertedIds[1]);
+        $this->assertInstanceOf('MongoDB\BSON\ObjectId', $insertedIds[1]);
 
         $expected = array(
             array('_id' => $insertedIds[0], 'x' => 11),
@@ -58,7 +58,7 @@ public function testUpdates()
 
         $upsertedIds = $result->getUpsertedIds();
         $this->assertSame(5, $upsertedIds[2]);
-        $this->assertInstanceOf('BSON\ObjectId', $upsertedIds[3]);
+        $this->assertInstanceOf('MongoDB\BSON\ObjectId', $upsertedIds[3]);
 
         $expected = array(
             array('_id' => 1, 'x' => 11),
@@ -215,4 +215,4 @@ private function createFixtures($n)
 
         $this->assertEquals($n, $result->getInsertedCount());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Model/IndexInputTest.php b/tests/Model/IndexInputTest.php
index 7b354a4d1..c3269313d 100644
--- a/tests/Model/IndexInputTest.php
+++ b/tests/Model/IndexInputTest.php
@@ -87,7 +87,7 @@ public function testBsonSerialization()
             'ns' => 'foo.bar',
         ));
 
-        $this->assertInstanceOf('BSON\Serializable', $indexInput);
+        $this->assertInstanceOf('MongoDB\BSON\Serializable', $indexInput);
         $this->assertEquals($expected, $indexInput->bsonSerialize());
     }
 }