diff --git a/src/yunohost/backup.py b/src/yunohost/backup.py
index 3978e835d..99337b2f8 100644
--- a/src/yunohost/backup.py
+++ b/src/yunohost/backup.py
@@ -2658,7 +2658,7 @@ def _recursive_umount(directory):
     points_to_umount = [
         line.split(" ")[2]
         for line in mount_lines
-        if len(line) >= 3 and line.split(" ")[2].startswith(directory)
+        if len(line) >= 3 and line.split(" ")[2].startswith(os.path.realpath(directory))
     ]
 
     everything_went_fine = True