diff --git a/app/models/room.rb b/app/models/room.rb
index 82650001..e657fd12 100644
--- a/app/models/room.rb
+++ b/app/models/room.rb
@@ -85,7 +85,7 @@ class Room < ApplicationRecord
   # Generates a uid for the room and BigBlueButton.
   def setup
     self.uid = random_room_uid
-    self.bbb_id = Digest::SHA1.hexdigest(Rails.application.secrets[:secret_key_base] + Time.now.to_i.to_s).to_s
+    self.bbb_id = unique_bbb_id
     self.moderator_pw = RandomPassword.generate(length: 12)
     self.attendee_pw = RandomPassword.generate(length: 12)
   end
@@ -100,4 +100,12 @@ class Room < ApplicationRecord
   def random_room_uid
     [owner.name_chunk, uid_chunk, uid_chunk].join('-').downcase
   end
+
+  # Generates a unique bbb_id based on uuid.
+  def unique_bbb_id
+    loop do
+      bbb_id = SecureRandom.hex(20)
+      break bbb_id unless Room.exists?(bbb_id: bbb_id)
+    end
+  end
 end