diff --git a/lib/Properties.hs b/lib/Properties.hs
index c4fc45867677cf603784d0a377c024694245b6e5..3d9b30f319c66916f29ffb6682af17254878825d 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -480,7 +480,7 @@ checkTileLayerProperty p@(Property name _value) = case name of
         -> do
           properties <- askContext <&> getProperties
           unless (all (\(Property name value) -> case value of
-                          StrProp str -> name /= "openWebsite" || "https://static.rc3.world" `isPrefixOf` str
+                          StrProp str -> name /= "openWebsite" || "https://static.rc3.world/" `isPrefixOf` str
                           _ -> True
                       ) properties)
             $ complain "\"openWebsiteAllowApi\" can only be used with websites hosted \