diff --git a/lib/Mongo/MongoCollection.php b/lib/Mongo/MongoCollection.php
index d9ea40f1..c18ffb5b 100644
--- a/lib/Mongo/MongoCollection.php
+++ b/lib/Mongo/MongoCollection.php
@@ -503,7 +503,7 @@ public function findAndModify(array $query, array $update = null, array $fields
             } else {
                 $update = is_array($update) ? $update : [];
                 if (isset($options['update']) && is_array($options['update'])) {
-                    $update = array_merge($update, $options['update']);
+                    $update = $options['update'];
                     unset($options['update']);
                 }
 
diff --git a/tests/Alcaeus/MongoDbAdapter/Mongo/MongoCollectionTest.php b/tests/Alcaeus/MongoDbAdapter/Mongo/MongoCollectionTest.php
index 450118af..e0a0e990 100644
--- a/tests/Alcaeus/MongoDbAdapter/Mongo/MongoCollectionTest.php
+++ b/tests/Alcaeus/MongoDbAdapter/Mongo/MongoCollectionTest.php
@@ -1254,6 +1254,35 @@ public function testFindAndModifyUpdateWithUpdateOptions()
         $this->assertObjectNotHasAttribute('foo', $object);
     }
 
+    public function testFindAndModifyWithUpdateParamAndOption()
+    {
+        $id = '54203e08d51d4a1f868b456e';
+        $collection = $this->getCollection();
+
+        $document = ['_id' => new \MongoId($id), 'foo' => 'bar'];
+        $collection->insert($document);
+
+        $data = ['foo' => 'foo', 'bar' => 'bar'];
+
+        $this->getCollection()->findAndModify(
+            ['_id' => new \MongoId($id)],
+            [$data],
+            [],
+            [
+                'update' => ['$set' => ['foo' => 'foobar']],
+                'upsert' => true,
+            ]
+        );
+
+        $newCollection = $this->getCheckDatabase()->selectCollection('test');
+        $this->assertSame(1, $newCollection->count());
+        $object = $newCollection->findOne();
+
+        $this->assertNotNull($object);
+        $this->assertAttributeSame('foobar', 'foo', $object);
+        $this->assertObjectNotHasAttribute('bar', $object);
+    }
+
     public function testFindAndModifyUpdateReplace()
     {
         $id = '54203e08d51d4a1f868b456e';