diff --git a/timm/models/beit.py b/timm/models/beit.py
index 3ba67031..99b5c832 100644
--- a/timm/models/beit.py
+++ b/timm/models/beit.py
@@ -40,7 +40,7 @@ Modifications by / Copyright 2021 Ross Wightman, original copyrights below
 
 import math
 from functools import partial
-from typing import Callable, Optional, Tuple, Union
+from typing import Callable, Final, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
@@ -80,6 +80,8 @@ def gen_relative_position_index(window_size: Tuple[int, int]) -> torch.Tensor:
 
 
 class Attention(nn.Module):
+    fast_attn: Final[bool]
+
     def __init__(
             self,
             dim: int,
diff --git a/timm/models/eva.py b/timm/models/eva.py
index 2daa04c0..92e5c7ad 100644
--- a/timm/models/eva.py
+++ b/timm/models/eva.py
@@ -26,7 +26,7 @@ Modifications by / Copyright 2023 Ross Wightman, original copyrights below
 # EVA02 models Copyright (c) 2023 BAAI-Vision
 
 import math
-from typing import Callable, Optional, Tuple, Union
+from typing import Callable, Final, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
@@ -44,6 +44,8 @@ __all__ = ['Eva']
 
 
 class EvaAttention(nn.Module):
+    fast_attn: Final[bool]
+
     def __init__(
             self,
             dim: int,