diff --git a/Aaru.Tests/Filesystems/ReadOnlyFilesystemTest.cs b/Aaru.Tests/Filesystems/ReadOnlyFilesystemTest.cs
index 86071cf01..a21922def 100644
--- a/Aaru.Tests/Filesystems/ReadOnlyFilesystemTest.cs
+++ b/Aaru.Tests/Filesystems/ReadOnlyFilesystemTest.cs
@@ -259,7 +259,7 @@ public abstract class ReadOnlyFilesystemTest : FilesystemTest
         }
     }
 
-    static Dictionary<string, FileData> BuildDirectory(IReadOnlyFilesystem fs, string path, int currentDepth)
+    internal static Dictionary<string, FileData> BuildDirectory(IReadOnlyFilesystem fs, string path, int currentDepth)
     {
         currentDepth++;