diff --git a/assets/layers/bench/bench.json b/assets/layers/bench/bench.json
index b1ac1c2d7..86f300922 100644
--- a/assets/layers/bench/bench.json
+++ b/assets/layers/bench/bench.json
@@ -159,7 +159,8 @@
         "fr": "Quelle est la couleur de ce banc ?"
       },
       "freeform": {
-        "key": "colour"
+        "key": "colour",
+        "type": "color"
       },
       "mappings": [
         {