diff --git a/config.json b/config.json
index 28d347e5efe5d8368d48dbbdb54f3688376e40b3..f7fc59db256ef85ab1a30a36747183f42ab5c1bd 100644
--- a/config.json
+++ b/config.json
@@ -16,12 +16,6 @@
       "scope" : ["map"],
       "substs" : {
       }
-    },
-    "bbb" : {
-      "scope" : ["bbb"],
-      "allowed" : [],
-      "blocked" : [],
-      "prefix" : "https://bbb.rc3.world/"
     }
   }
 }
diff --git a/lib/Properties.hs b/lib/Properties.hs
index 37b6bc42bdcd26c96b7230f86db23829cdaa7f7a..dd680ea9ca136d61852f792171aad46c5ddc9cd7 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -40,7 +40,7 @@ import           LintWriter    (LintWriter, adjust, askContext, askFileDepth,
 import           Paths         (PathResult (..), RelPath (..), getExtension,
                                 isOldStyle, parsePath)
 import           Types         (Dep (Link, Local, LocalMap, MapLink))
-import           Uris          (SubstError (..), applySubst)
+import           Uris          (SubstError (..), applySubst, parseUri)
 
 
 -- | Checks an entire map for "general" lints.
@@ -289,15 +289,16 @@ checkTileLayerProperty p@(Property name _value) = case name of
       isIntInRange 0 100 p
     "bbbRoom" -> do
       removeProperty "bbbRoom"
-      unwrapURI (Proxy @"bbb") p
-        (\link -> do
-            dependsOn (Link link)
-            setProperty "openWebsite" link
-            setProperty "silent" (BoolProp True)
-            setProperty "openWebsitePolicy"
-              ("fullscreen;camera;microphone;display-capture" :: Text)
-        )
-        (const $ complain "property \"bbbRoom\" cannot be used with local links.")
+      unwrapString p $ \str -> case parseUri str of
+        Just ("bbb",assembly_slug, room_slug)
+          | "/" `isPrefixOf` room_slug && T.length room_slug >= 2 -> do
+          let link = "https://rc3.world/assembly/"<>assembly_slug<>"/bbb"<>room_slug
+          dependsOn (Link link)
+          setProperty "openWebsite" link
+          setProperty "silent" (BoolProp True)
+          setProperty "openWebsitePolicy"
+            ("fullscreen;camera;microphone;display-capture" :: Text)
+        _ -> complain "the \"bbbRoom\" property must take a link of the form bbb://assembly_slug/room_slug."
     "bbbTrigger" -> do
       removeProperty "bbbTrigger"
       requireProperty "bbbRoom"