diff --git a/stylesheets/map.ost b/stylesheets/map.ost
index be2725804..e5435e5a9 100644
--- a/stylesheets/map.ost
+++ b/stylesheets/map.ost
@@ -85,6 +85,7 @@ GRADES
     "asphalt"
     "cobblestone"
     "cobblestone:flattened"
+    "unhewn_cobblestone"
     "concrete"
     "concrete:lanes"
     "concrete:plates"