diff --git a/mock/c7-firefox91.armhfp.cfg b/mock/c7-firefox91.armhfp.cfg
index 6326115..12ee652 100644
--- a/mock/c7-firefox91.armhfp.cfg
+++ b/mock/c7-firefox91.armhfp.cfg
@@ -1,7 +1,7 @@
 config_opts['root'] = 'TARGETNAME'
 config_opts['target_arch'] = 'armv7hl'
 config_opts['legal_host_arches'] = ('armv7l')
-config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils system-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'
+config_opts['chroot_setup_cmd'] = 'install bash bzip2 coreutils cpio diffutils system-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-build'
 config_opts['dist'] = 'el7'  # only useful for --resultdir variable subst
 config_opts['extra_chroot_dirs'] = [ '/run/lock', ]
 config_opts['macros']['%dist'] = ".el7"