diff --git a/nova/tests/test_libvirt_config.py b/nova/tests/test_libvirt_config.py
index e270ca2a..a00d5b57 100644
--- a/nova/tests/test_libvirt_config.py
+++ b/nova/tests/test_libvirt_config.py
@@ -319,6 +319,22 @@ class LibvirtConfigGuestDiskTest(LibvirtConfigBaseTest):
               <target bus="ide" dev="/dev/hda"/>
             </disk>""")
 
+    def test_config_file_serial(self):
+        obj = config.LibvirtConfigGuestDisk()
+        obj.source_type = "file"
+        obj.source_path = "/tmp/hello"
+        obj.target_dev = "/dev/hda"
+        obj.target_bus = "ide"
+        obj.serial = "7a97c4a3-6f59-41d4-bf47-191d7f97f8e9"
+
+        xml = obj.to_xml()
+        self.assertXmlEqual(xml, """
+            <disk type="file" device="disk">
+              <source file="/tmp/hello"/>
+              <target bus="ide" dev="/dev/hda"/>
+              <serial>7a97c4a3-6f59-41d4-bf47-191d7f97f8e9</serial>
+            </disk>""")
+
     def test_config_block(self):
         obj = config.LibvirtConfigGuestDisk()
         obj.source_type = "block"