diff --git a/__tests__/cache-restore.test.ts b/__tests__/cache-restore.test.ts
index 90153a403..8ff99b07d 100644
--- a/__tests__/cache-restore.test.ts
+++ b/__tests__/cache-restore.test.ts
@@ -2,16 +2,15 @@ import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 import * as path from 'path';
 import * as glob from '@actions/glob';
+import osm from 'os';
 
 import * as utils from '../src/cache-utils';
 import {restoreCache} from '../src/cache-restore';
 
 describe('cache-restore', () => {
   process.env['GITHUB_WORKSPACE'] = path.join(__dirname, 'data');
-  if (!process.env.RUNNER_OS) {
-    process.env.RUNNER_OS = 'Linux';
-  }
-  const platform = process.env.RUNNER_OS;
+  const platform = 'Linux';
+  const arch = 'arm64';
   const commonPath = '/some/random/path';
   const npmCachePath = `${commonPath}/npm`;
   const pnpmCachePath = `${commonPath}/pnpm`;
@@ -52,6 +51,8 @@ describe('cache-restore', () => {
   let getCommandOutputSpy: jest.SpyInstance;
   let restoreCacheSpy: jest.SpyInstance;
   let hashFilesSpy: jest.SpyInstance;
+  let archSpy: jest.SpyInstance;
+  let platformSpy: jest.SpyInstance;
 
   beforeEach(() => {
     // core
@@ -102,6 +103,13 @@ describe('cache-restore', () => {
 
     // cache-utils
     getCommandOutputSpy = jest.spyOn(utils, 'getCommandOutput');
+
+    // os
+    archSpy = jest.spyOn(osm, 'arch');
+    archSpy.mockImplementation(() => arch);
+
+    platformSpy = jest.spyOn(osm, 'platform');
+    platformSpy.mockImplementation(() => platform);
   });
 
   describe('Validate provided package manager', () => {
@@ -135,7 +143,7 @@ describe('cache-restore', () => {
         await restoreCache(packageManager, '');
         expect(hashFilesSpy).toHaveBeenCalled();
         expect(infoSpy).toHaveBeenCalledWith(
-          `Cache restored from key: node-cache-${platform}-${packageManager}-${fileHash}`
+          `Cache restored from key: node-cache-${platform}-${arch}-${packageManager}-${fileHash}`
         );
         expect(infoSpy).not.toHaveBeenCalledWith(
           `${packageManager} cache is not found`
diff --git a/dist/setup/index.js b/dist/setup/index.js
index c4b448b1d..4fb187cff 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -92559,6 +92559,7 @@ const core = __importStar(__nccwpck_require__(2186));
 const glob = __importStar(__nccwpck_require__(8090));
 const path_1 = __importDefault(__nccwpck_require__(1017));
 const fs_1 = __importDefault(__nccwpck_require__(7147));
+const os_1 = __importDefault(__nccwpck_require__(2037));
 const constants_1 = __nccwpck_require__(9042);
 const cache_utils_1 = __nccwpck_require__(1678);
 const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0, void 0, void 0, function* () {
@@ -92566,7 +92567,8 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
     if (!packageManagerInfo) {
         throw new Error(`Caching for '${packageManager}' is not supported`);
     }
-    const platform = process.env.RUNNER_OS;
+    const platform = os_1.default.platform();
+    const arch = os_1.default.arch();
     const cachePaths = yield (0, cache_utils_1.getCacheDirectories)(packageManagerInfo, cacheDependencyPath);
     core.saveState(constants_1.State.CachePaths, cachePaths);
     const lockFilePath = cacheDependencyPath
@@ -92576,7 +92578,7 @@ const restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0,
     if (!fileHash) {
         throw new Error('Some specified paths were not resolved, unable to cache dependencies.');
     }
-    const keyPrefix = `node-cache-${platform}-${packageManager}`;
+    const keyPrefix = `node-cache-${platform}-${arch}-${packageManager}`;
     const primaryKey = `${keyPrefix}-${fileHash}`;
     core.debug(`primary key is ${primaryKey}`);
     core.saveState(constants_1.State.CachePrimaryKey, primaryKey);
diff --git a/src/cache-restore.ts b/src/cache-restore.ts
index 3b230970e..f5ad58ffa 100644
--- a/src/cache-restore.ts
+++ b/src/cache-restore.ts
@@ -3,6 +3,7 @@ import * as core from '@actions/core';
 import * as glob from '@actions/glob';
 import path from 'path';
 import fs from 'fs';
+import os from 'os';
 
 import {State} from './constants';
 import {
@@ -20,7 +21,8 @@ export const restoreCache = async (
   if (!packageManagerInfo) {
     throw new Error(`Caching for '${packageManager}' is not supported`);
   }
-  const platform = process.env.RUNNER_OS;
+  const platform = os.platform();
+  const arch = os.arch();
 
   const cachePaths = await getCacheDirectories(
     packageManagerInfo,
@@ -38,7 +40,7 @@ export const restoreCache = async (
     );
   }
 
-  const keyPrefix = `node-cache-${platform}-${packageManager}`;
+  const keyPrefix = `node-cache-${platform}-${arch}-${packageManager}`;
   const primaryKey = `${keyPrefix}-${fileHash}`;
   core.debug(`primary key is ${primaryKey}`);