diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index 35199b9..8866e97 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -138,7 +138,8 @@
 mount_extra() {
   for partition in $@; do
     mnt_point="/$partition"
-    mountpoint "$mnt_point" >/dev/null 2>&1 && break
+    mountpoint "$mnt_point" >/dev/null 2>&1 && continue
+    [ -L "$SYSMOUNT/$partition" ] && continue
 
     blk_dev=$(find_block "$partition")
     if [ -e "$blk_dev" ]; then
diff --git a/prebuilt/common/bin/backuptool_ab.sh b/prebuilt/common/bin/backuptool_ab.sh
index b1513e5..433ec78 100755
--- a/prebuilt/common/bin/backuptool_ab.sh
+++ b/prebuilt/common/bin/backuptool_ab.sh
@@ -149,7 +149,8 @@
 mount_extra() {
   for partition in $@; do
     mnt_point="/postinstall/$partition"
-    mountpoint "$mnt_point" >/dev/null 2>&1 && break
+    mountpoint "$mnt_point" >/dev/null 2>&1 && continue
+    [ -L "$mnt_point" ] && continue
 
     blk_dev=$(find_block "$partition")
     if [ -n "$blk_dev" ]; then