diff --git a/Squidex.Infrastructure.EventStore/EventStoreSubscription.cs b/Squidex.Infrastructure.EventStore/EventStoreSubscription.cs
index eac21ad06..22ed3ec33 100644
--- a/Squidex.Infrastructure.EventStore/EventStoreSubscription.cs
+++ b/Squidex.Infrastructure.EventStore/EventStoreSubscription.cs
@@ -118,6 +118,7 @@ namespace Squidex.Infrastructure.EventStore
         {
             var sb = new StringBuilder();
 
+            sb.Append("by-");
             sb.Append(prefix.Trim(' ', '-'));
             sb.Append("-");