diff --git a/pina/model/block/pod_block.py b/pina/model/block/pod_block.py
index 9b0b303..290cb0d 100644
--- a/pina/model/block/pod_block.py
+++ b/pina/model/block/pod_block.py
@@ -1,6 +1,7 @@
 """Module for Base Continuous Convolution class."""
 
 import torch
+import warnings
 
 
 class PODBlock(torch.nn.Module):