diff --git a/lib/event_source/stream_name.rb b/lib/event_source/stream_name.rb
index <HASH>..<HASH> 100644
--- a/lib/event_source/stream_name.rb
+++ b/lib/event_source/stream_name.rb
@@ -2,9 +2,7 @@ module EventSource
   module StreamName
     extend self
 
-    def stream_name(category_name, id=nil)
-      id ||= Identifier::UUID.random
-
+    def stream_name(category_name, id)
       "#{category_name}-#{id}"
     end
StreamName creation does not optionally randomize IDs