diff --git a/userspace/marsadm b/userspace/marsadm
index 679bee53..81ca4510 100755
--- a/userspace/marsadm
+++ b/userspace/marsadm
@@ -2100,9 +2100,11 @@ sub attach_res_phase2 {
   return if $force;
   check_status($cmd, $res, "is-attached", $detach ? 0 : 1, 1);
   if ($detach) {
+    system("sync");
     check_mars_device($cmd, $res, 1, 1);
     check_status($cmd, $res, "is-replaying", 0, 1);
     check_status($cmd, $res, "is-syncing", 0, 1);
+    system("sync");
   }
 }