diff --git a/src/libraries/Common/src/System/IO/FileSystem.Attributes.Windows.cs b/src/libraries/Common/src/System/IO/FileSystem.Attributes.Windows.cs
index 977293e3fe89d..274f049f58471 100644
--- a/src/libraries/Common/src/System/IO/FileSystem.Attributes.Windows.cs
+++ b/src/libraries/Common/src/System/IO/FileSystem.Attributes.Windows.cs
@@ -81,7 +81,7 @@ internal static int FillAttributeInfo(string? path, ref Interop.Kernel32.WIN32_F
                         )
                     {
                         // Assert so we can track down other cases (if any) to add to our test suite
-                        Debug.Assert(errorCode == Interop.Errors.ERROR_ACCESS_DENIED || errorCode == Interop.Errors.ERROR_SHARING_VIOLATION,
+                        Debug.Assert(errorCode == Interop.Errors.ERROR_ACCESS_DENIED || errorCode == Interop.Errors.ERROR_SHARING_VIOLATION || errorCode == Interop.Errors.ERROR_SEM_TIMEOUT,
                             $"Unexpected error code getting attributes {errorCode} from path {path}");
 
                         // Files that are marked for deletion will not let you GetFileAttributes,