diff --git a/Makefile b/Makefile
index 8932e18..8cb1f07 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ raspi_3.yaml: raspi_master.yaml
 	sha256sum $(@:sha256=img.xz) > $@
 
 %.img.xz: %.img
-	xz -f -z -9 $(@:.xz=)
+	xz -f -k -z -9 $(@:.xz=)
 
 %.img: %.yaml
 	touch $(@:.img=.log)
@@ -47,12 +47,14 @@ _clean_yaml:
 	rm -f raspi_0w.yaml raspi_2.yaml raspi_3.yaml
 _clean_images:
 	rm -f raspi_0w.img raspi_2.img raspi_3.img
+_clean_xzimages:
+	rm -f raspi_0w.img.xz raspi_2.img.xz raspi_3.img.xz
 _clean_shasums:
 	rm -f raspi_0w.sha256 raspi_2.sha256 raspi_3.sha256
 _clean_logs:
 	rm -f raspi_0w.log raspi_2.log raspi_3.log
 _clean_tarballs:
 	rm -f raspi_0w.tar.gz raspi_2.tar.gz raspi_3.tar.gz
-clean: _clean_images _clean_shasums _clean_yaml _clean_tarballs _clean_logs
+clean: _clean_xzimages _clean_images _clean_shasums _clean_yaml _clean_tarballs _clean_logs
 
 .PHONY: _ck_root _build_img clean _clean_images _clean_yaml _clean_tarballs _clean_logs