diff --git a/osu.Game.Tests/Database/BeatmapImporterTests.cs b/osu.Game.Tests/Database/BeatmapImporterTests.cs
index 0eac70f9c8..38746f2567 100644
--- a/osu.Game.Tests/Database/BeatmapImporterTests.cs
+++ b/osu.Game.Tests/Database/BeatmapImporterTests.cs
@@ -716,7 +716,7 @@ public void TestRollbackOnFailure()
                 {
                     foreach (var entry in zip.Entries.ToArray())
                     {
-                        if (entry.Key.EndsWith(".osu", StringComparison.InvariantCulture))
+                        if (entry.Key!.EndsWith(".osu", StringComparison.InvariantCulture))
                             zip.RemoveEntry(entry);
                     }