diff --git a/botorch/posteriors/gpytorch.py b/botorch/posteriors/gpytorch.py
index da79563160..dd04957625 100644
--- a/botorch/posteriors/gpytorch.py
+++ b/botorch/posteriors/gpytorch.py
@@ -23,6 +23,7 @@
 from linear_operator import settings as linop_settings
 from linear_operator.operators import (
     BlockDiagLinearOperator,
+    DenseLinearOperator,
     LinearOperator,
     SumLinearOperator,
 )
@@ -323,6 +324,7 @@ def scalarize_posterior_gpytorch(
         if isinstance(cov_scaled, LinearOperator):
             cov_scaled = cov_scaled.to_dense()
         new_cov = cov_scaled.view(sum_shape).sum(dim=sum_dims[0]).sum(dim=sum_dims[1])
+        new_cov = DenseLinearOperator(new_cov)
 
     return new_mean, new_cov