diff --git a/src/Core__Array.mjs b/src/Core__Array.mjs
index e7127f01..f675dff5 100644
--- a/src/Core__Array.mjs
+++ b/src/Core__Array.mjs
@@ -21,6 +21,12 @@ function lastIndexOfOpt(arr, item) {
   
 }
 
+function sort(arr, cmp) {
+  var result = arr.slice();
+  result.sort(cmp);
+  return result;
+}
+
 function reduce(a, x, f) {
   var f$1 = Curry.__2(f);
   var r = x;
@@ -107,6 +113,7 @@ function flatMap(a, f) {
 }
 
 export {
+  sort ,
   indexOfOpt ,
   lastIndexOfOpt ,
   reduce ,
diff --git a/src/Core__Array.res b/src/Core__Array.res
index 43d80d2d..658f45c8 100644
--- a/src/Core__Array.res
+++ b/src/Core__Array.res
@@ -39,8 +39,6 @@ external copyWithin: (array<'a>, ~target: int, ~start: int, ~end: int) => array<
 
 @send external shift: array<'a> => option<'a> = "shift"
 
-@send external sortInPlace: (array<'a>, ('a, 'a) => int) => unit = "sort"
-
 @variadic @send
 external spliceInPlace: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => unit =
   "splice"
@@ -78,6 +76,14 @@ let lastIndexOfOpt = (arr, item) =>
 @send external sliceToEnd: (array<'a>, ~start: int) => array<'a> = "slice"
 @send external copy: array<'a> => array<'a> = "slice"
 
+@send external sortInPlace: (array<'a>, ('a, 'a) => int) => unit = "sort"
+
+let sort = (arr, cmp) => {
+  let result = copy(arr)
+  sortInPlace(result, cmp)
+  result
+}
+
 @send external toString: array<'a> => string = "toString"
 @send external toLocaleString: array<'a> => string = "toLocaleString"
 
diff --git a/src/Core__Array.resi b/src/Core__Array.resi
index e97aeaa0..562f739d 100644
--- a/src/Core__Array.resi
+++ b/src/Core__Array.resi
@@ -20,6 +20,7 @@ external copyWithin: (array<'a>, ~target: int, ~start: int, ~end: int) => array<
 @variadic @send external pushMany: (array<'a>, array<'a>) => unit = "push"
 @send external reverseInPlace: array<'a> => unit = "reverse"
 @send external shift: array<'a> => option<'a> = "shift"
+let sort: (array<'a>, ('a, 'a) => int) => array<'a>
 @send external sortInPlace: (array<'a>, ('a, 'a) => int) => unit = "sort"
 @variadic @send
 external spliceInPlace: (array<'a>, ~start: int, ~remove: int, ~insert: array<'a>) => unit =
diff --git a/src/Core__List.mjs b/src/Core__List.mjs
index 6d3a026e..8da20a23 100644
--- a/src/Core__List.mjs
+++ b/src/Core__List.mjs
@@ -4,7 +4,6 @@ import * as Curry from "rescript/lib/es6/curry.js";
 import * as Belt_Array from "rescript/lib/es6/belt_Array.js";
 import * as Caml_option from "rescript/lib/es6/caml_option.js";
 import * as Core__Array from "./Core__Array.mjs";
-import * as Belt_SortArray from "rescript/lib/es6/belt_SortArray.js";
 
 function head(x) {
   if (x) {
@@ -1177,9 +1176,8 @@ function setAssoc(xs, x, k, eq) {
 }
 
 function sort(xs, cmp) {
-  var cmp$1 = Curry.__2(cmp);
   var arr = toArray(xs);
-  Belt_SortArray.stableSortInPlaceByU(arr, cmp$1);
+  arr.sort(cmp);
   return fromArray(arr);
 }
 
diff --git a/src/Core__List.res b/src/Core__List.res
index 88924bb7..27c248e7 100644
--- a/src/Core__List.res
+++ b/src/Core__List.res
@@ -793,14 +793,12 @@ let setAssocU = (xs, x, k, eq) =>
 
 let setAssoc = (xs, x, k, eq) => setAssocU(xs, x, k, (. a, b) => eq(a, b))
 
-let sortU = (xs, cmp) => {
+let sort = (xs, cmp) => {
   let arr = toArray(xs)
-  Belt_SortArray.stableSortInPlaceByU(arr, cmp)
+  Core__Array.sortInPlace(arr, cmp)
   fromArray(arr)
 }
 
-let sort = (xs, cmp) => sortU(xs, (. x, y) => cmp(x, y))
-
 let rec getByU = (xs, p) =>
   switch xs {
   | list{} => None