diff --git a/config b/config
index d2c1942..d292c9f 100644
--- a/config
+++ b/config
@@ -25,7 +25,7 @@ TMPDIR="/var/tmp"
 ARCHES=(x86_64)
 DBEXT=".db.tar.gz"
 FILESEXT=".files.tar.gz"
-PKGEXT=".pkg.tar.?z"
+PKGEXT=".pkg.tar.xz"
 SRCEXT=".src.tar.gz"
 
 # Allowed licenses: get sourceballs only for licenses in this array