diff --git a/src/Arch/Core/World.cs b/src/Arch/Core/World.cs
index e4547a1..c98e19c 100644
--- a/src/Arch/Core/World.cs
+++ b/src/Arch/Core/World.cs
@@ -608,7 +608,7 @@ public Entity Duplicate(Entity sourceEntity)
 
         OnEntityCreated(sourceEntity);
 #if EVENTS
-        foreach (ref var type in archetype.Types)
+        foreach (var type in archetype.Types)
         {
             OnComponentAdded(sourceEntity, type);
         }