diff --git a/tutorcairn/plugin.py b/tutorcairn/plugin.py
index d1b3980..e54e704 100644
--- a/tutorcairn/plugin.py
+++ b/tutorcairn/plugin.py
@@ -36,7 +36,7 @@
         "RUN_POSTGRESQL": True,
         "POSTGRESQL_DATABASE": "superset",
         "POSTGRESQL_USERNAME": "superset",
-        "SUPERSET_DOCKER_IMAGE": "{: DOCKER_REGISTRY }}overhangio/cairn-superset:{{ CAIRN_VERSION }}",
+        "SUPERSET_DOCKER_IMAGE": "{{ DOCKER_REGISTRY }}overhangio/cairn-superset:{{ CAIRN_VERSION }}",
         "SUPERSET_LANGUAGE_CODE": "{{ LANGUAGE_CODE[:2] }}",
         # SSO
         "ENABLE_SSO": True,