diff --git a/bootstrap.sh b/bootstrap.sh
index bcd67ce..aeaad17 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -745,7 +745,7 @@ BuildRequires: pkgconfig, redhat-lsb$(
     if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then
       echo -n ", qt5-qtwebkit-devel";
     fi)
-%if 0%{?fedora} || 0%{?rhel} || 0%{?rhl}
+%if ! ( 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version} )
 $(if testtag AX_USE_DOXYGEN; then echo -n "BuildRequires: mscgen"; fi)
 $(if testtag AX_REQUIRE_QT || testtag AX_CHECK_QT; then echo -n "BuildRequires: qt5-qtbase-devel, qt5-qttools, qt5-qtwebkit-devel"; fi)
 %else
diff --git a/libxml-cxx.spec.in b/libxml-cxx.spec.in
index e8b470e..ea7a313 100644
--- a/libxml-cxx.spec.in
+++ b/libxml-cxx.spec.in
@@ -9,7 +9,7 @@ BuildRequires: gnupg, subversion, automake, autoconf, doxygen, graphviz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 %if 0%{?fedora} || 0%{?rhel} || 0%{?rhl} || 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version}
 BuildRequires: pkgconfig, redhat-lsb, cppunit-devel
-%if 0%{?fedora} || 0%{?rhel} || 0%{?rhl}
+%if ! ( 0%{?centos} || 0%{?centos_ver} || 0%{?centos_version} )
 BuildRequires: mscgen
 
 %else