diff --git a/support/download/helpers b/support/download/helpers
index 4c5eb466cc..ab31e27a69 100755
--- a/support/download/helpers
+++ b/support/download/helpers
@@ -78,7 +78,7 @@ post_process_unpack() {
     local one_file
 
     mkdir "${dest}"
-    tar -C "${dest}" --strip-components=1 -xf "${tarball}"
+    tar -C "${dest}" --strip-components=1 -xzf "${tarball}"
     one_file="$(find "${dest}" -type f -print0 |LC_ALL=C sort -z |head -z -n1 |tr -d "\0")"
     touch -r "${one_file}" "${dest}.timestamp"
 }