diff --git a/pina/pinn.py b/pina/pinn.py
index 8a2527b..03929cb 100644
--- a/pina/pinn.py
+++ b/pina/pinn.py
@@ -77,9 +77,9 @@ class PINN(object):
         :param vec torch.tensor: the tensor
         """
         if isinstance(self.error_norm, int):
-            return torch.sum(torch.abs(vec**self.error_norm))**(1./self.error_norm)
+            return torch.linalg.vector_norm(vec, ord = self.error_norm,  dtype=self.dytpe)
         elif self.error_norm == 'mse':
-            return torch.mean(vec**2)
+            return torch.mean(vec.pow(2))
         elif self.error_norm == 'me':
             return torch.mean(torch.abs(vec))
         else: