diff --git a/vm/src/builtins/memory.rs b/vm/src/builtins/memory.rs
index 8b1777356..94ff9fd01 100644
--- a/vm/src/builtins/memory.rs
+++ b/vm/src/builtins/memory.rs
@@ -10,6 +10,7 @@ use crate::{
     bytesinner::bytes_to_hex,
     function::{FuncArgs, IntoPyObject, OptionalArg},
     protocol::{BufferDescriptor, BufferMethods, PyBuffer, PyMappingMethods, VecBuffer},
+    sequence::SequenceOp,
     sliceable::wrap_index,
     stdlib::pystruct::FormatSpec,
     types::{AsBuffer, AsMapping, Comparable, Constructor, Hashable, PyComparisonOp},
@@ -629,16 +630,22 @@ impl PyMemoryView {
                 ));
             }
 
+            let tup;
+            let list;
+            let list_borrow;
             let shape = match shape {
-                Either::A(tup) => {
-                    let elements = tup.as_slice().iter().cloned().collect_vec();
-                    vm.ctx.new_list(elements)
+                Either::A(shape) => {
+                    tup = shape;
+                    tup.as_slice()
+                }
+                Either::B(shape) => {
+                    list = shape;
+                    list_borrow = list.borrow_vec();
+                    list_borrow.as_slice()
                 }
-                Either::B(list) => list,
             };
 
-            let shape_vec = shape.borrow_vec();
-            let shape_ndim = shape_vec.len();
+            let shape_ndim = shape.len();
             // TODO: MAX_NDIM
             if self.desc.ndim() != 1 && shape_ndim != 1 {
                 return Err(
@@ -659,7 +666,7 @@ impl PyMemoryView {
             let mut product_shape = itemsize;
             let mut dim_descriptor = Vec::with_capacity(shape_ndim);
 
-            for x in shape_vec.iter() {
+            for x in shape.iter() {
                 let x = usize::try_from_borrowed_object(vm, x)?;
 
                 if x > isize::MAX as usize / product_shape {