diff --git a/lib/Properties.hs b/lib/Properties.hs
index 66cedd904a678f988c0a79bea2d1ddee42c25751..f142493f5ba2bf22f3bb82338b3898f1afa0e655 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -292,7 +292,6 @@ checkObjectProperty p@(Property name _) = do
                  \either property \"bell\" or \"door\" also set."
 
   _ | name `elem` [ "default", "persist" ] -> do
-        isBool p
         suggestPropertyName' "door"
     -- extended API for doors and bells
     | name `elem` [ "openLayer", "closeLayer" ] -> do