diff --git a/tests/PureHDF.Tests/Selections/SelectionTests.cs b/tests/PureHDF.Tests/Selections/SelectionTests.cs
index e668cd14..69da0003 100644
--- a/tests/PureHDF.Tests/Selections/SelectionTests.cs
+++ b/tests/PureHDF.Tests/Selections/SelectionTests.cs
@@ -571,7 +571,7 @@ void action() => _ = SelectionHelper.Walk(
             chunkDims, 
             selection,
             allowBulkCopy: true
-        );
+        ).ToArray();
 
         // Assert
         Assert.Throws<RankException>(action);