diff --git a/build_backend.sh b/build_backend.sh
index a9afe25..e911f9b 100644
--- a/build_backend.sh
+++ b/build_backend.sh
@@ -35,12 +35,12 @@ if [ `grep $iommu /etc/default/grub|wc -l` = 0 ];then
    sed -i 's|quiet|quiet '$iommu'|' /etc/default/grub
    update-grub
    if [ `grep "vfio" /etc/modules|wc -l` = 0 ];then
-      cat <<-EOF >> /etc/modules
-         vfio
-         vfio_iommu_type1
-         vfio_pci
-         vfio_virqfd
-      EOF
+cat <<-EOF >> /etc/modules
+ vfio
+ vfio_iommu_type1
+ vfio_pci
+ vfio_virqfd
+EOF
    fi
 else
    _green "已设置硬件直通"