diff --git a/Aaru.Tests/Images/BlockMediaImageTest.cs b/Aaru.Tests/Images/BlockMediaImageTest.cs
index 1047ec774..6420eb4a9 100644
--- a/Aaru.Tests/Images/BlockMediaImageTest.cs
+++ b/Aaru.Tests/Images/BlockMediaImageTest.cs
@@ -220,6 +220,7 @@ public abstract class BlockMediaImageTest : BaseMediaImageTest
 
                             var          sr           = new FileStream(expectedDataFilename, FileMode.Open);
                             VolumeData[] expectedData = JsonSerializer.Deserialize<VolumeData[]>(sr, serializerOptions);
+                            sr.Close();
 
                             Assert.NotNull(expectedData);