diff --git a/boot/mkinitramfs.sh b/boot/mkinitramfs.sh
index b12c5cc..0f7d7f3 100755
--- a/boot/mkinitramfs.sh
+++ b/boot/mkinitramfs.sh
@@ -83,6 +83,7 @@ bin_install \
     /bin/mount \
     /bin/rm \
     /bin/sh \
+    /bin/sleep \
     /bin/sort \
     /bin/tail \
     /bin/umount \