diff --git a/templates/services/droneci_compose.yml.j2 b/templates/services/droneci_compose.yml.j2
index 852ef0c..6960d88 100644
--- a/templates/services/droneci_compose.yml.j2
+++ b/templates/services/droneci_compose.yml.j2
@@ -42,7 +42,7 @@ services:
       - DRONE_USER_FILTER={{ droneci_user_filter | join(",") }}
       {% endif %}
       {% if droneci_repository_filter is defined and droneci_repository_filter | length > 0 %}
-      - DRONE_REPOSITORY_FILTER={{ droneci_repository_filter }}
+      - DRONE_REPOSITORY_FILTER={{ droneci_repository_filter | join(",") }}
       {% endif %}
       - DRONE_LOGS_COLOR=true
       - DRONE_LOGS_PRETTY=true