diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index af047bcdab5041afcb3576460fd8d73a553115e3..f5a5a451560222b4e93d37656e5f190aebf4c51c 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -134,6 +134,7 @@ pub fn OpenFile(sub_path_w: []const u16, options: OpenFileOptions) OpenError!HAN
         .OBJECT_NAME_COLLISION => return error.PathAlreadyExists,
         .FILE_IS_A_DIRECTORY => return error.IsDir,
         .NOT_A_DIRECTORY => return error.NotDir,
+        .USER_MAPPED_FILE => return error.AccessDenied,
         .INVALID_HANDLE => unreachable,
         else => return unexpectedStatus(rc),
     }