diff --git a/lib/system/supports-colors.js b/lib/system/supports-colors.js
index 68034fc..d2b02a3 100644
--- a/lib/system/supports-colors.js
+++ b/lib/system/supports-colors.js
@@ -76,7 +76,7 @@ function supportsColor(stream) {
 		return 0;
 	}
 
-	const min = forceColor ? 1 : 0;
+	var min = forceColor ? 1 : 0;
 
 	if (process.platform === 'win32') {
 		// Node.js 7.5.0 is the first version of Node.js to include a patch to
@@ -143,7 +143,7 @@ function supportsColor(stream) {
 }
 
 function getSupportLevel(stream) {
-	const level = supportsColor(stream);
+	var level = supportsColor(stream);
 	return translateLevel(level);
 }