diff --git a/src/ObservableCollections/ObservableQueue.cs b/src/ObservableCollections/ObservableQueue.cs
index 2a66ca6..db18b5b 100644
--- a/src/ObservableCollections/ObservableQueue.cs
+++ b/src/ObservableCollections/ObservableQueue.cs
@@ -171,7 +171,7 @@ namespace ObservableCollections
             }
         }
 
-        public bool TryPeek([MaybeNullWhen(false)] T result)
+        public bool TryPeek([MaybeNullWhen(false)] out T result)
         {
             lock (SyncRoot)
             {