diff --git a/dist/index.js b/dist/index.js
index 8e20d7f..aa4b7a5 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -419,24 +419,15 @@ class DotnetCoreInstaller {
 exports.DotnetCoreInstaller = DotnetCoreInstaller;
 _a = DotnetCoreInstaller;
 (() => {
-    const installationDirectoryWindows = path_1.default.join(process.env['PROGRAMFILES'] + '', 'dotnet');
-    const installationDirectoryLinux = '/usr/share/dotnet';
-    const installationDirectoryMac = path_1.default.join(process.env['HOME'] + '', '.dotnet');
-    const dotnetInstallDir = process.env['DOTNET_INSTALL_DIR'];
-    if (dotnetInstallDir) {
-        process.env['DOTNET_INSTALL_DIR'] =
-            _a.convertInstallPathToAbsolute(dotnetInstallDir);
-    }
-    else {
-        if (utils_1.IS_WINDOWS) {
-            process.env['DOTNET_INSTALL_DIR'] = installationDirectoryWindows;
-        }
-        else {
-            process.env['DOTNET_INSTALL_DIR'] = utils_1.IS_LINUX
-                ? installationDirectoryLinux
-                : installationDirectoryMac;
-        }
-    }
+    const dotnetInstallDirDefault = {
+        linux: '/usr/share/dotnet',
+        mac: path_1.default.join(process.env['HOME'] + '', '.dotnet'),
+        windows: path_1.default.join(process.env['PROGRAMFILES'] + '', 'dotnet')
+    }[(0, utils_1.getPlatform)()];
+    const dotnetInstallDir = process.env['DOTNET_INSTALL_DIR']
+        ? _a.convertInstallPathToAbsolute(process.env['DOTNET_INSTALL_DIR'])
+        : dotnetInstallDirDefault;
+    process.env['DOTNET_INSTALL_DIR'] = dotnetInstallDir;
 })();
 
 
@@ -591,9 +582,17 @@ run();
 "use strict";
 
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.IS_LINUX = exports.IS_WINDOWS = void 0;
+exports.getPlatform = exports.IS_LINUX = exports.IS_WINDOWS = void 0;
 exports.IS_WINDOWS = process.platform === 'win32';
 exports.IS_LINUX = process.platform === 'linux';
+const getPlatform = () => {
+    if (exports.IS_WINDOWS)
+        return 'windows';
+    if (exports.IS_LINUX)
+        return 'linux';
+    return 'mac';
+};
+exports.getPlatform = getPlatform;
 
 
 /***/ }),
diff --git a/src/installer.ts b/src/installer.ts
index ef9e993..b2132ef 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -8,7 +8,7 @@ import {readdir} from 'fs/promises';
 import path from 'path';
 import os from 'os';
 import semver from 'semver';
-import {IS_LINUX, IS_WINDOWS} from './utils';
+import {IS_WINDOWS, getPlatform} from './utils';
 import {QualityOptions} from './setup-dotnet';
 
 export interface DotnetVersion {
@@ -115,29 +115,17 @@ export class DotnetCoreInstaller {
   private quality: QualityOptions;
 
   static {
-    const installationDirectoryWindows = path.join(
-      process.env['PROGRAMFILES'] + '',
-      'dotnet'
-    );
-    const installationDirectoryLinux = '/usr/share/dotnet';
-    const installationDirectoryMac = path.join(
-      process.env['HOME'] + '',
-      '.dotnet'
-    );
-    const dotnetInstallDir: string | undefined =
-      process.env['DOTNET_INSTALL_DIR'];
-    if (dotnetInstallDir) {
-      process.env['DOTNET_INSTALL_DIR'] =
-        this.convertInstallPathToAbsolute(dotnetInstallDir);
-    } else {
-      if (IS_WINDOWS) {
-        process.env['DOTNET_INSTALL_DIR'] = installationDirectoryWindows;
-      } else {
-        process.env['DOTNET_INSTALL_DIR'] = IS_LINUX
-          ? installationDirectoryLinux
-          : installationDirectoryMac;
-      }
-    }
+    const dotnetInstallDirDefault = {
+      linux: '/usr/share/dotnet',
+      mac: path.join(process.env['HOME'] + '', '.dotnet'),
+      windows: path.join(process.env['PROGRAMFILES'] + '', 'dotnet')
+    }[getPlatform()];
+
+    const dotnetInstallDir = process.env['DOTNET_INSTALL_DIR']
+      ? this.convertInstallPathToAbsolute(process.env['DOTNET_INSTALL_DIR'])
+      : dotnetInstallDirDefault;
+
+    process.env['DOTNET_INSTALL_DIR'] = dotnetInstallDir;
   }
 
   constructor(version: string, quality: QualityOptions) {
diff --git a/src/utils.ts b/src/utils.ts
index 77886ce..d671d70 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,2 +1,7 @@
 export const IS_WINDOWS = process.platform === 'win32';
 export const IS_LINUX = process.platform === 'linux';
+export const getPlatform = (): 'windows' | 'linux' | 'mac' => {
+  if (IS_WINDOWS) return 'windows';
+  if (IS_LINUX) return 'linux';
+  return 'mac';
+};