diff --git a/src/freedombone-utils-backup b/src/freedombone-utils-backup
index 564d03d3..cb75411b 100755
--- a/src/freedombone-utils-backup
+++ b/src/freedombone-utils-backup
@@ -118,7 +118,11 @@ function backup_to_friends_servers {
 
 function backup_mount_drive {
     if [ $1 ]; then
-        USB_DRIVE=/dev/${1}1
+        if [[ "$1" == "/dev/"* ]]; then
+            USB_DRIVE=$1
+        else
+            USB_DRIVE=/dev/${1}1
+        fi
     fi
 
     # get the admin user