diff --git a/autoconf-archive.spec b/autoconf-archive.spec
index e561df4..3183507 100644
--- a/autoconf-archive.spec
+++ b/autoconf-archive.spec
@@ -20,7 +20,8 @@ GNU Autoconf that have been contributed as free software by friendly
 supporters of the cause from all over the Internet.
 
 %prep
-%setup -q
+xzcat %{SOURCE0} | tar -xf -
+%setup -qDT
 
 %build
 %configure