diff --git a/src/ol/array.js b/src/ol/array.js
index 06185a4d8a..518538641c 100644
--- a/src/ol/array.js
+++ b/src/ol/array.js
@@ -208,20 +208,6 @@ export function stableSort(arr, compareFnc) {
   }
 }
 
-/**
- * @param {Array<*>} arr The array to search in.
- * @param {Function} func Comparison function.
- * @return {number} Return index.
- */
-export function findIndex(arr, func) {
-  let index;
-  const found = !arr.every(function (el, idx) {
-    index = idx;
-    return !func(el, idx, arr);
-  });
-  return found ? index : -1;
-}
-
 /**
  * @param {Array<*>} arr The array to test.
  * @param {Function} [opt_func] Comparison function.
diff --git a/src/ol/source/WMTS.js b/src/ol/source/WMTS.js
index 72ac18b4ee..a9f2322d5f 100644
--- a/src/ol/source/WMTS.js
+++ b/src/ol/source/WMTS.js
@@ -9,7 +9,6 @@ import {containsExtent} from '../extent.js';
 import {createFromCapabilitiesMatrixSet} from '../tilegrid/WMTS.js';
 import {createFromTileUrlFunctions, expandUrl} from '../tileurlfunction.js';
 import {equivalent, get as getProjection, transformExtent} from '../proj.js';
-import {findIndex} from '../array.js';
 
 /**
  * Request encoding. One of 'KVP', 'REST'.
@@ -382,7 +381,7 @@ export function optionsFromCapabilities(wmtsCap, config) {
   let idx;
   if (l['TileMatrixSetLink'].length > 1) {
     if ('projection' in config) {
-      idx = findIndex(l['TileMatrixSetLink'], function (elt, index, array) {
+      idx = l['TileMatrixSetLink'].findIndex(function (elt) {
         const tileMatrixSet = tileMatrixSets.find(function (el) {
           return el['Identifier'] == elt['TileMatrixSet'];
         });
@@ -396,7 +395,7 @@ export function optionsFromCapabilities(wmtsCap, config) {
         }
       });
     } else {
-      idx = findIndex(l['TileMatrixSetLink'], function (elt, index, array) {
+      idx = l['TileMatrixSetLink'].findIndex(function (elt) {
         return elt['TileMatrixSet'] == config['matrixSet'];
       });
     }
@@ -417,7 +416,7 @@ export function optionsFromCapabilities(wmtsCap, config) {
   if ('format' in config) {
     format = config['format'];
   }
-  idx = findIndex(l['Style'], function (elt, index, array) {
+  idx = l['Style'].findIndex(function (elt) {
     if ('style' in config) {
       return elt['Title'] == config['style'];
     } else {
diff --git a/test/node/ol/array.test.js b/test/node/ol/array.test.js
index d314660abf..c881b808f2 100644
--- a/test/node/ol/array.test.js
+++ b/test/node/ol/array.test.js
@@ -3,7 +3,6 @@ import {
   binarySearch,
   equals,
   extend,
-  findIndex,
   isSorted,
   linearFindNearest,
   numberSafeCompareFunction,
@@ -382,26 +381,6 @@ describe('ol/array.js', function () {
     });
   });
 
-  describe('findIndex', function () {
-    it('finds index of numbers in an array', function () {
-      const a = [0, 1, 2, 3];
-      const b = findIndex(a, function (val, index, a2) {
-        expect(a).to.equal(a2);
-        expect(typeof index).to.be('number');
-        return val > 1;
-      });
-      expect(b).to.be(2);
-    });
-
-    it('returns -1 when an item in an array is not found', function () {
-      const a = [0, 1, 2, 3];
-      const b = findIndex(a, function (val, index, a2) {
-        return val > 100;
-      });
-      expect(b).to.be(-1);
-    });
-  });
-
   describe('isSorted', function () {
     it('works with just an array as argument', function () {
       expect(isSorted([1, 2, 3])).to.be(true);