diff --git a/include/download.mk b/include/download.mk
index 83e0c166ea..3ce7ba22e1 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -52,7 +52,7 @@ endef
 # code for creating tarballs from cvs/svn/git/bzr/hg/darcs checkouts - useful for mirror support
 dl_pack/bz2=bzip2 -c > $(1)
 dl_pack/gz=gzip -nc > $(1)
-dl_pack/xz=xz -zc -7e > $(1)
+dl_pack/xz=xz -T0 -zc -7e > $(1)
 dl_pack/zst=zstd -T0 --ultra -20 -c > $(1)
 dl_pack/unknown=$(error ERROR: Unknown pack format for file $(1))
 define dl_pack