diff --git a/addonsu/unmount-system.sh b/addonsu/unmount-system.sh
new file mode 100644
index 0000000..60c5e18
--- /dev/null
+++ b/addonsu/unmount-system.sh
@@ -0,0 +1,15 @@
+#!/sbin/sh
+
+# Modern devices use /system as root ("/")
+system_as_root=`getprop ro.build.system_root_image`
+if [ "$system_as_root" == "true" ]; then
+  if umount /system && umount /system_root; then
+    exit 0
+  fi
+fi
+
+if umount /system; then
+    exit 0
+fi
+
+exit 1