diff --git a/src/mrpro/utils/reshape.py b/src/mrpro/utils/reshape.py
index 742d4f55e..2a6923337 100644
--- a/src/mrpro/utils/reshape.py
+++ b/src/mrpro/utils/reshape.py
@@ -100,7 +100,7 @@ def reduce_view(x: torch.Tensor, dim: int | Sequence[int] | None = None) -> torc
     ]
     return torch.as_strided(x, newsize, stride)
 
-
+@lru_cache
 def _reshape_idx(old_shape: tuple[int, ...], new_shape: tuple[int, ...], old_stride: tuple[int, ...]) -> list[slice]:
     """Get reshape reduce index (Cached helper function for reshape_broadcasted)