diff --git a/src/DotRecast.Core/Collections/RcSortedQueue.cs b/src/DotRecast.Core/Collections/RcSortedQueue.cs
index 0c06aad..cb09d63 100644
--- a/src/DotRecast.Core/Collections/RcSortedQueue.cs
+++ b/src/DotRecast.Core/Collections/RcSortedQueue.cs
@@ -88,7 +88,7 @@ namespace DotRecast.Core.Collections
                 return false;
 
             //int idx = _items.BinarySearch(item, _comparer); // don't use this! Because reference types can be reused externally.
-            int idx = _items.FindLastIndex(x => item.Equals(x));
+            int idx = _items.LastIndexOf(item);
             if (0 > idx)
                 return false;