diff --git a/euca2ools/commands/bundle/bundlevolume.py b/euca2ools/commands/bundle/bundlevolume.py
index 94c12be4..cb75a9ea 100644
--- a/euca2ools/commands/bundle/bundlevolume.py
+++ b/euca2ools/commands/bundle/bundlevolume.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2009-2016 Hewlett Packard Enterprise Development LP
+# Copyright (c) 2009-2017 Hewlett Packard Enterprise Development LP
 #
 # Redistribution and use of this software in source and binary forms,
 # with or without modification, are permitted provided that the following
@@ -397,6 +397,7 @@ def __update_filesystem_ids(self, device, fsinfo):
             subprocess.check_call(cmd)
 
     def __detach_disk_image(self, image, device):
+        subprocess.check_call(['sync'])
         if self.args['partition'] in ('mbr', 'gpt'):
             self.log.debug('unmapping partitioned image %s', image)
             cmd = ['kpartx', '-s', '-d', image]