diff --git a/iptables.spec b/iptables.spec
index 505085a..016fde1 100644
--- a/iptables.spec
+++ b/iptables.spec
@@ -36,7 +36,7 @@ BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 %if 0%{?suse_version}
 BuildRequires:	sgmltool
 %endif
-%if 0%{?fedora_version}
+%if 0%{?fedora_version} || 0%{?centos_version}
 BuildRequires:	sgml-common
 Provides:	iptables-ipv6 = %version-%release
 Obsoletes:	iptables-ipv6 < %version-%release