diff --git a/Recyclable.CollectionsTests/RecyclableListTests.cs b/Recyclable.CollectionsTests/RecyclableListTests.cs
index 430edcb..231838d 100644
--- a/Recyclable.CollectionsTests/RecyclableListTests.cs
+++ b/Recyclable.CollectionsTests/RecyclableListTests.cs
@@ -355,7 +355,7 @@ namespace Recyclable.CollectionsTests
 
 			// Act
 			var actual = new List<long>();
-			var enumerator = list.GetEnumerator();
+			using var enumerator = list.GetEnumerator();
 			while (enumerator.MoveNext())
 			{
 				actual.Add(enumerator.Current);
diff --git a/Recyclable.CollectionsTests/RecyclableQueueTests.cs b/Recyclable.CollectionsTests/RecyclableQueueTests.cs
index b09ed28..4940eb9 100644
--- a/Recyclable.CollectionsTests/RecyclableQueueTests.cs
+++ b/Recyclable.CollectionsTests/RecyclableQueueTests.cs
@@ -107,7 +107,7 @@ namespace Recyclable.CollectionsTests
 
 			// Act
 			var actual = new RecyclableList<string>();
-			var enumerator = list.GetEnumerator();
+			using var enumerator = list.GetEnumerator();
 			while (enumerator.MoveNext())
 			{
 				actual.Add(enumerator.Current);
diff --git a/Recyclable.CollectionsTests/RecyclableStackTests.cs b/Recyclable.CollectionsTests/RecyclableStackTests.cs
index 9507043..e6330a0 100644
--- a/Recyclable.CollectionsTests/RecyclableStackTests.cs
+++ b/Recyclable.CollectionsTests/RecyclableStackTests.cs
@@ -15,7 +15,7 @@ namespace Recyclable.CollectionsTests
 
 			// Act
 			var actual = new RecyclableList<string>();
-			var enumerator = list.GetEnumerator();
+			using var enumerator = list.GetEnumerator();
 			while (enumerator.MoveNext())
 			{
 				actual.Add(enumerator.Current);