diff --git a/timm/models/_manipulate.py b/timm/models/_manipulate.py
index f40ff9ac47..c6042712d9 100644
--- a/timm/models/_manipulate.py
+++ b/timm/models/_manipulate.py
@@ -8,6 +8,7 @@
 import torch
 import torch.utils.checkpoint
 from torch import nn as nn
+from torch import Tensor
 
 from timm.layers import use_reentrant_ckpt
 
@@ -284,7 +285,7 @@ def forward(_x):
     return x
 
 
-def adapt_input_conv(in_chans, conv_weight):
+def adapt_input_conv(in_chans: int, conv_weight: Tensor) -> Tensor:
     conv_type = conv_weight.dtype
     conv_weight = conv_weight.float()  # Some weights are in torch.half, ensure it's float for sum on CPU
     O, I, J, K = conv_weight.shape