diff --git a/templates/config.toml.j2 b/templates/config.toml.j2
index c3bdd3b..32fdd24 100644
--- a/templates/config.toml.j2
+++ b/templates/config.toml.j2
@@ -124,17 +124,17 @@ sentry_dsn = "{{ gitlab_runner_sentry_dsn }}"
 {% if gitlab_runner.docker_security_opt is defined %}
     security_opt = {{ gitlab_runner.docker_security_opt | tojson }}
 {% endif %}
-{% if gitlab_runner.extra_configs %}
+{% if gitlab_runner.extra_configs is defined %}
 {% if 'runners.docker' in gitlab_runner.extra_configs %}
 {% for key, value in gitlab_runner.extra_configs['runners.docker'].items() %}
     {{ key }} = {{ value | tojson }}
 {% endfor %}
 {% endif %}
-{#### [[runners.docker.sysctls]] section ####}
+{#### [runners.docker.sysctls] section ####}
 {% if 'runners.docker.sysctls' in gitlab_runner.extra_configs %}
     [runners.docker.sysctls]
 {% for key, value in gitlab_runner.extra_configs['runners.docker.sysctls'].items() %}
-      {{ key }} = {{ value | tojson }}
+      "{{ key }}" = {{ value | tojson }}
 {% endfor %}
 {% endif %}
 {% endif %}