diff --git a/torchinterp1d/interp1d.py b/torchinterp1d/interp1d.py
index 059338d..636bc3d 100644
--- a/torchinterp1d/interp1d.py
+++ b/torchinterp1d/interp1d.py
@@ -147,7 +147,7 @@ def sel(name):
                 ynew = ynew.view(original_xnew_shape)
 
         ctx.save_for_backward(ynew, *saved_inputs)
-        return ynew
+        return ynew.detach()
 
     @staticmethod
     def backward(ctx, grad_out):
@@ -165,4 +165,4 @@ def backward(ctx, grad_out):
         return (*result,)
 
 
-interp1d = Interp1d.apply
\ No newline at end of file
+interp1d = Interp1d.apply