diff --git a/xen.spec b/xen.spec
index b90befb..8eafc56 100644
--- a/xen.spec
+++ b/xen.spec
@@ -92,7 +92,7 @@ BuildRequires:  dev86
 # JWF: Until Anthony's series to load BIOS via toolstack is merged,
 # autoconf is needed by autogen.sh.
 # http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg01626.html
-BuildRequires:  autoconf
+BuildRequires:  autoconf >= 2.67
 BuildRequires:  bison
 BuildRequires:  fdupes
 BuildRequires:  figlet