diff --git a/usr/lib/archboot/installer/mountpoints.sh b/usr/lib/archboot/installer/mountpoints.sh
index 4c61cb034..c44f2f7a6 100644
--- a/usr/lib/archboot/installer/mountpoints.sh
+++ b/usr/lib/archboot/installer/mountpoints.sh
@@ -232,7 +232,7 @@ _mountpoints() {
                 _check_mkfs_values
                 echo "${_DEV}:${_FSTYPE}:${_MP}:${_DOMKFS}:${_LABEL_NAME}:${_FS_OPTIONS}:${_BTRFS_DEVS}:${_BTRFS_LEVEL}:${_BTRFS_SUBVOLUME}:${_BTRFS_COMPRESS}" >>/tmp/.parts
                 #shellcheck disable=SC2001,SC2086
-                ! [[ "${_FSTYPE}" == "btrfs" || -n ${_DO_ROOT} ]] && _DEVS="${_DEVS//$(${_LSBLK} NAME,SIZE -d "${_DEV}")/}"
+                [[ ! "${_FSTYPE}" == "btrfs" || -n ${_DO_ROOT} ]] && _DEVS="${_DEVS//$(${_LSBLK} NAME,SIZE -d "${_DEV}")/}"
             fi
             _DO_ROOT=""
         done