diff --git a/src/libraries/System.IO.FileSystem/tests/File/Copy.cs b/src/libraries/System.IO.FileSystem/tests/File/Copy.cs
index 8fd9ea4183e16..aa3c929bad1c8 100644
--- a/src/libraries/System.IO.FileSystem/tests/File/Copy.cs
+++ b/src/libraries/System.IO.FileSystem/tests/File/Copy.cs
@@ -343,7 +343,7 @@ public void WindowsAlternateDataStreamOverwrite(string defaultStream, string alt
     /// <summary>
     /// Single tests that shouldn't be duplicated by inheritance.
     /// </summary>
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/40867", TestPlatforms.Browser)]
+    [PlatformSpecific(~TestPlatforms.Browser)] // https://github.com/dotnet/runtime/issues/40867 - flock not supported
     public sealed class File_Copy_Single : FileSystemTest
     {
         [Fact]