diff --git a/lib/build-and-upload.js b/lib/build-and-upload.js
index 8dfcba2..b171666 100644
--- a/lib/build-and-upload.js
+++ b/lib/build-and-upload.js
@@ -2,12 +2,11 @@ import { localPlace, remotePlace } from './places.js';
 import build from './build.js';
 import chalk from 'chalk';
 import patchesJson from '../patches/patches.json';
+import platform from './system.js';
 import { targets } from './system.js';
 import upload from './upload.js';
 import { version } from '../package.json';
 
-const { platform } = process;
-
 function isBrokenBuild (nodeVersion, target) {
   if (/^v?0/.test(nodeVersion) &&
       /^arm/.test(target)) return true;
diff --git a/lib/build.js b/lib/build.js
index 5afaa29..f3d687a 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -5,8 +5,7 @@ import path from 'path';
 import rimraf from 'rimraf-promise';
 import { spawn } from './spawn.js';
 
-const platform = process.platform;
-const windows = platform === 'win32';
+const windows = process.platform === 'win32';
 const buildPath = path.resolve(__dirname, '../temp');
 const nodePath = path.join(buildPath, 'node');
 const patchesPath = path.resolve(__dirname, '../patches');
diff --git a/lib/system.js b/lib/system.js
index 83b4174..76ac125 100644
--- a/lib/system.js
+++ b/lib/system.js
@@ -4,6 +4,13 @@ function getAbi () {
   return 'm' + process.versions.modules;
 }
 
+function getPlatform () {
+  var platform = process.platform;
+  if (platform === 'darwin') return 'osx';
+  if (platform === 'win32') return 'win';
+  return platform;
+}
+
 function getArmHost () {
   var cpu = fs.readFileSync('/proc/cpuinfo', 'utf8');
   if (cpu.indexOf('vfpv3') >= 0) return 'armv7';
@@ -36,6 +43,7 @@ function getKnownTargets () {
 }
 
 export const abi = getAbi();
+export const platform = getPlatform();
 export const host = getHost();
 export const targets = getTargets();
 export const knownTargets = getKnownTargets();