diff --git a/lib/Properties.hs b/lib/Properties.hs
index e5947510d2f5e1098ac5f6798e1f25fdb10c56ee..b586c7ea9a07d0711e188c2555d41c504ea6b5f5 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -492,7 +492,8 @@ checkTileThing removeExits p@(Property name _value) = case name of
             (dependsOn . Link)
             (const $ forbid "accessing local html files is disallowed.")
       | otherwise ->
-        warnUnknown p knownTileLayerProperites
+        when (not removeExits || name `notElem` [ "collides", "name", "tilesetCopyright" ]) $ do
+          warnUnknown p knownTileLayerProperites
     where
       requireProperty req = propertyRequiredBy req name
       requireOneOf names = do