diff --git a/tripleo_ansible/roles/tripleo_container_image_build/templates/Containerfile.j2 b/tripleo_ansible/roles/tripleo_container_image_build/templates/Containerfile.j2
index a2856164a..e44e15cd9 100644
--- a/tripleo_ansible/roles/tripleo_container_image_build/templates/Containerfile.j2
+++ b/tripleo_ansible/roles/tripleo_container_image_build/templates/Containerfile.j2
@@ -14,7 +14,7 @@
 # under the License.
 
 {% for key, value in tcib_args.items() %}
-ARG = {{ key }}={{ value | to_json }}
+ARG {{ key }}={{ value | to_json }}
 {% endfor %}
 FROM {{ tcib_from }}
 {% for key, value in tcib_labels.items() %}