diff --git a/controls/roles/update-changes/molecule/215/verify.yml b/controls/roles/update-changes/molecule/215/verify.yml
index b7318e7f6..0a1c4b100 100644
--- a/controls/roles/update-changes/molecule/215/verify.yml
+++ b/controls/roles/update-changes/molecule/215/verify.yml
@@ -89,4 +89,5 @@
           - Lighthouse_service_configuration.command | select('match', '--produce-block-v3=false') | length == 0
           - Teku_Beacon_service_configuration.command | select('match', '--validators-graffiti-client-append-format=DISABLED') | length == 1
           - charon_service_configuration.command | select('match', '--feature-set-enable=json_requests') | length == 1
+          - charon_service_configuration.command | select('match', '--builder-api') | length == 1
 # EOF
diff --git a/controls/roles/update-changes/tasks/2.1.5/charon_changes.yaml b/controls/roles/update-changes/tasks/2.1.5/charon_changes.yaml
index e842cd533..04c0ecc5e 100644
--- a/controls/roles/update-changes/tasks/2.1.5/charon_changes.yaml
+++ b/controls/roles/update-changes/tasks/2.1.5/charon_changes.yaml
@@ -16,4 +16,12 @@
     line: "{{ service_configuration_text | split('\n') | select('match', '^\\s*- --beacon-node-endpoints') | first | split('-') | first }}- --feature-set-enable=json_requests"
   when:
     - service_configuration.dependencies.consensusClients | selectattr('service', 'equalto', 'NimbusBeaconService') | list | length > 0
-    - service_configuration.command | select('match', '--feature-set-enable=json_requests') | length == 0
\ No newline at end of file
+    - service_configuration.command | select('match', '--feature-set-enable=json_requests') | length == 0
+
+  - name: add builder tag if not present
+    lineinfile:
+      path: "{{ config_file_path }}"
+      insertafter: "--beacon-node-endpoints"
+      line: "{{ service_configuration_text | split('\n') | select('match', '^\\s*- --beacon-node-endpoints') | first | split('-') | first }}- --builder-api"
+    when:
+      - service_configuration.command | select('match', '--builder-api') | length == 0
\ No newline at end of file