diff --git a/pymritools/recon/loraks/p_loraks.py b/pymritools/recon/loraks/p_loraks.py
index c8ed88d..20311ba 100644
--- a/pymritools/recon/loraks/p_loraks.py
+++ b/pymritools/recon/loraks/p_loraks.py
@@ -297,8 +297,6 @@ def _initialize_matrix_indices(self):
             self.patch_shape,
             self.sample_directions
         )
-        if self.operator_type == OperatorType.S:
-            self.matrix_operator_shape = tuple(2 * d for d in self.matrix_operator_shape)
 
     def _get_operator_matrix_size(self) -> tuple[int, int]:
         """
@@ -470,4 +468,4 @@ def reconstruct_batch(self, k_space_batch: torch.Tensor, idx_batch: int = 0) ->
             )
 
         # k is our converged best guess candidate, need to unwrap / reshape
-        return k
\ No newline at end of file
+        return k