diff --git a/nixos/modules/tasks/filesystems.nix b/nixos/modules/tasks/filesystems.nix
index 7cb2ca23fa41..3f553948d78d 100644
--- a/nixos/modules/tasks/filesystems.nix
+++ b/nixos/modules/tasks/filesystems.nix
@@ -188,8 +188,7 @@ let
       # https://wiki.archlinux.org/index.php/fstab#Filepath_spaces
       escape = string: builtins.replaceStrings [ " " "\t" ] [ "\\040" "\\011" ] string;
     in fstabFileSystems: { rootPrefix ? "" }: concatMapStrings (fs:
-      (optionalString (isBindMount fs) (escape rootPrefix))
-      + (if fs.device != null then escape fs.device
+      (if fs.device != null then escape fs.device
          else if fs.label != null then "/dev/disk/by-label/${escape fs.label}"
          else throw "No device specified for mount point ‘${fs.mountPoint}’.")
       + " " + escape fs.mountPoint