diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index e7c175f7f..7df7cfd99 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -61,6 +61,7 @@ FlagList kMountFlagsList[] = {
         {"nodiratime", MS_NODIRATIME},
         {"ro", MS_RDONLY},
         {"rw", 0},
+        {"sync", MS_SYNCHRONOUS},
         {"remount", MS_REMOUNT},
         {"bind", MS_BIND},
         {"rec", MS_REC},