diff --git a/support/download/bzr b/support/download/bzr
index cec9ce8f37..a8a8887151 100755
--- a/support/download/bzr
+++ b/support/download/bzr
@@ -32,4 +32,6 @@ _bzr() {
     eval ${BZR} "${@}"
 }
 
-_bzr export ${verbose} --root="'${basename}/'" --format=tgz "'${output}'" "'${repo}'" -r "'${rev}'"
+_bzr export ${verbose} --root="'${basename}/'" --format=tgz \
+    --per-file-timestamps - "'${repo}'" -r "'${rev}'" \
+    >"${output}"