diff --git a/roles/copr/backend/files/provision/files/mock/site-defaults.cfg b/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
index d8491025e5..399126e6fd 100644
--- a/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
+++ b/roles/copr/backend/files/provision/files/mock/site-defaults.cfg
@@ -14,12 +14,14 @@ config_opts['plugin_conf']['compress_logs_enable'] = True
 config_opts['plugin_conf']['compress_logs_opts'] = {}
 config_opts['plugin_conf']['compress_logs_opts']['command'] = "/usr/bin/gzip -9 --force"
 
+{% if ansible_architecture == 'x86_64' %}
 config_opts['plugin_conf']['tmpfs_enable'] = True
 config_opts['plugin_conf']['tmpfs_opts'] = {}
 config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 1024
 config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = '75g'
 config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
 config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = False
+{% endif %}
 
 {% if ansible_distribution == 'Fedora' and ansible_distribution_major_version|int > 21 %}
 config_opts['yum_command'] = '/usr/bin/yum-deprecated'