diff --git a/tinygrad/shape/shapetracker.py b/tinygrad/shape/shapetracker.py
index a5a88c2441..8bbc051fad 100644
--- a/tinygrad/shape/shapetracker.py
+++ b/tinygrad/shape/shapetracker.py
@@ -49,11 +49,9 @@ def simplify(views:Tuple[View, ...]) -> Tuple[View, ...]:
 @functools.lru_cache(maxsize=None)
 def idxs_to_idx(shape:Tuple[int, ...], idxs:Tuple[Node, ...]) -> Node:
   assert len(idxs) == len(shape), "need an idx for all dimensions"
-  acc, ret = 1, []
-  for tidx,d in zip(reversed(idxs), reversed(shape)):
-    ret.append(tidx * acc)
-    acc *= d
-  return Node.sum(ret)
+  # idxs[-1] * 1 + idxs[-2] * shape[-1] + idxs[-3] * shape[-1] * shape[-2] + ...
+  accs = itertools.accumulate(reversed(shape[1:]), operator.mul, initial=1)
+  return Node.sum([idx * acc for idx, acc in zip(reversed(idxs), accs)])
 
 @dataclass(frozen=True)
 class ShapeTracker: