diff --git a/packages/common/utils/platforms.ts b/packages/common/utils/platforms.ts
index 6bb26bd6..c0d84326 100644
--- a/packages/common/utils/platforms.ts
+++ b/packages/common/utils/platforms.ts
@@ -1,4 +1,4 @@
-export const platformResolver = (platform: string) => {
+export function platformResolver(platform: string) {
     let platformType = '';
     let platformFileType = '';
     let platformCommand = '';
@@ -6,7 +6,7 @@ export const platformResolver = (platform: string) => {
     switch (platform) {
         case 'win32':
             platformType = 'windows';
-            platformFileType = 'exe';
+            platformFileType = '.exe';
             platformCommand = 'start ""';
             break;
 
@@ -17,10 +17,9 @@ export const platformResolver = (platform: string) => {
 
         case 'darwin':
             platformType = 'macos';
-            platformFileType = 'macos';
             platformCommand = 'open -R';
             break;
     }
 
     return { platformType, platformFileType, platformCommand };
-};
+}
diff --git a/packages/updater/index.ts b/packages/updater/index.ts
index 600e9324..ddab272b 100644
--- a/packages/updater/index.ts
+++ b/packages/updater/index.ts
@@ -14,8 +14,13 @@ import path from 'path';
 // NOTE: _version.js packs with pkg support in tosu build
 const currentVersion = require(process.cwd() + '/_version.js');
 
+const platform = platformResolver(process.platform);
+
 const fileDestination = path.join(getProgramPath(), 'update.zip');
-const backupExecutablePath = path.join(getProgramPath(), 'tosu_old.exe');
+const backupExecutablePath = path.join(
+    getProgramPath(),
+    `tosu_old${platform.platformFileType}`
+);
 
 const deleteNotLocked = async (filePath: string) => {
     try {
@@ -36,9 +41,7 @@ export const checkUpdates = async () => {
     wLogger.info('Checking updates');
 
     try {
-        const { platformType } = platformResolver(process.platform);
-
-        if (platformType === '') {
+        if (platform.platformType === '') {
             wLogger.warn(
                 `Unsupported platform (${process.platform}). Unable to run updater`
             );
@@ -69,7 +72,7 @@ export const checkUpdates = async () => {
             return new Error('Version the same');
         }
 
-        return { assets, versionName, platformType };
+        return { assets, versionName };
     } catch (exc) {
         wLogger.error(`checkUpdates`, (exc as any).message);
         wLogger.debug(exc);
@@ -88,7 +91,7 @@ export const autoUpdater = async () => {
             return check;
         }
 
-        const { assets, versionName, platformType } = check;
+        const { assets, versionName } = check;
         if (versionName.includes(currentVersion)) {
             wLogger.info(`You're using latest version v${currentVersion}`);
 
@@ -104,10 +107,14 @@ export const autoUpdater = async () => {
         }
 
         const findAsset = assets.find(
-            (r) => r.name.includes(platformType) && r.name.endsWith('.zip')
+            (r) =>
+                r.name.includes(platform.platformType) &&
+                r.name.endsWith('.zip')
         );
         if (!findAsset) {
-            wLogger.info(`Files to update not found (${platformType})`);
+            wLogger.info(
+                `Files to update not found (${platform.platformType})`
+            );
             return 'noFiles';
         }