diff --git a/lib/std/os.zig b/lib/std/os.zig
index 5c97d616901db4c723af97d4c22f44072e18291b..ac9bbcfeaa36accafd79f3c533f76b588ff7e82e 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -3809,7 +3809,7 @@ pub fn faccessatW(dirfd: fd_t, sub_path_w: [*:0]const u16, mode: u32, flags: u32
         .SUCCESS => return,
         .OBJECT_NAME_NOT_FOUND => return error.FileNotFound,
         .OBJECT_PATH_NOT_FOUND => return error.FileNotFound,
-        .OBJECT_NAME_INVALID => return error.BadPathName,
+        .OBJECT_NAME_INVALID => unreachable,
         .INVALID_PARAMETER => unreachable,
         .ACCESS_DENIED => return error.PermissionDenied,
         .OBJECT_PATH_SYNTAX_BAD => unreachable,