diff --git a/lib/system/supports-colors.js b/lib/system/supports-colors.js
index 26b4cbd..67802ad 100644
--- a/lib/system/supports-colors.js
+++ b/lib/system/supports-colors.js
@@ -24,10 +24,10 @@ THE SOFTWARE.
 */
 
 'use strict';
-const os = require('os');
-const hasFlag = require('./has-flag.js');
+var os = require('os');
+var hasFlag = require('./has-flag.js');
 
-const env = process.env;
+var env = process.env;
 
 let forceColor;
 if (hasFlag('no-color') ||
@@ -85,7 +85,7 @@ function supportsColor(stream) {
 		// release, and Node.js 7 is not. Windows 10 build 10586 is the first Windows
 		// release that supports 256 colors. Windows 10 build 14931 is the first release
 		// that supports 16m/TrueColor.
-		const osRelease = os.release().split('.');
+		var osRelease = os.release().split('.');
 		if (
 			Number(process.versions.node.split('.')[0]) >= 8 &&
 			Number(osRelease[0]) >= 10 &&
@@ -110,7 +110,7 @@ function supportsColor(stream) {
 	}
 
 	if ('TERM_PROGRAM' in env) {
-		const version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
+		var version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
 
 		switch (env.TERM_PROGRAM) {
 			case 'iTerm.app':