diff --git a/mock/c7-devtoolset-6.ppc.cfg b/mock/c7-devtoolset-6.ppc.cfg
index 8f3067c..e94b51f 100644
--- a/mock/c7-devtoolset-6.ppc.cfg
+++ b/mock/c7-devtoolset-6.ppc.cfg
@@ -1,6 +1,6 @@
 config_opts['root'] = 'TARGETNAME'
 config_opts['target_arch'] = 'ppc'
-config_opts['legal_host_arches'] = ('ppc',)
+config_opts['legal_host_arches'] = ('ppc','ppc64')
 config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils centos-release findutils gawk gcc gcc-c++ grep gzip info make patch redhat-rpm-config rpm-build sed shadow-utils tar unzip util-linux which xz scl-utils scl-utils-build devtoolset devtoolset-build'
 config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst