diff --git a/public/templates/data.tmpl b/public/templates/data.tmpl
index 6036a9c..d396dfc 100644
--- a/public/templates/data.tmpl
+++ b/public/templates/data.tmpl
@@ -92,7 +92,7 @@
         },
         "contour": {
           "type": "vector",
-          "tiles": [ "{{public_url}}data/{{id}}/contour/{z}/{x}/{y}" ],
+          "tiles": "{{public_url}}data/{{id}}/contour/{z}/{x}/{y}" ],
         }
       },
       "glyphs": "/fonts/{fontstack}/{range}.pbf",