diff --git a/src/tiles.rs b/src/tiles.rs
index beb5042..1949614 100644
--- a/src/tiles.rs
+++ b/src/tiles.rs
@@ -47,7 +47,7 @@ pub struct TileDef
 where
 {
     /// Whether the tile emits light, and the light source offset
-    pub layer: <Bg as TileLayer>::SpecificDef,
+    pub layer: (),
     //ADD pub blend_graphic: String,
 }
 
diff --git a/tiles.rs b/tiles.rs
index beb5042..794689d 100644
--- a/tiles.rs
+++ b/tiles.rs
@@ -46,8 +46,7 @@ impl TileLayer for Fg {
 pub struct TileDef
 where
 {
-    /// Whether the tile emits light, and the light source offset
-    pub layer: <Bg as TileLayer>::SpecificDef,
+    pub layer: (),
     //ADD pub blend_graphic: String,
 }