diff --git a/roles/build-container-image/tasks/build.yaml b/roles/build-container-image/tasks/build.yaml
index 36dcbc6df..36dd384a6 100644
--- a/roles/build-container-image/tasks/build.yaml
+++ b/roles/build-container-image/tasks/build.yaml
@@ -40,7 +40,7 @@
     {% for build_arg in zj_image.build_args | default([]) -%}
       --build-arg {{ build_arg }}
     {% endfor -%}
-    {% if zj_images.siblings | default(false) -%}
+    {% if zj_image.siblings | default(false) -%}
       --build-arg "ZUUL_SIBLINGS={{ zj_image.siblings | join(' ') }}"
     {% endif -%}
     {% for tag in zj_image.tags | default(['latest']) -%}