diff --git a/lib/debootstrap.sh b/lib/debootstrap.sh
index 708924b818..cdb43ff98c 100644
--- a/lib/debootstrap.sh
+++ b/lib/debootstrap.sh
@@ -636,7 +636,7 @@ PREPARE_IMAGE_SIZE
 
 	check_loop_device "$LOOP"
 
-	losetup $LOOP ${SDCARD}.raw
+	losetup -P $LOOP ${SDCARD}.raw
 
 	# loop device was grabbed here, unlock
 	flock -u $FD