From b96d75d81704a9777e3fea371a8a2e4ef26db8fa Mon Sep 17 00:00:00 2001
From: Stijn de Witt <StijnDeWitt@hotmail.com>
Date: Mon, 3 Jul 2017 14:14:27 +0200
Subject: [PATCH] Remove deprecated stuff #16

---
 src/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 077f21d..5700084 100644
--- a/src/index.js
+++ b/src/index.js
@@ -42,7 +42,7 @@ function is(x, type) {
 		while (c !== Object) {
 			if (c === type || c === type.class) return true
 			if (type.mixin && type.mixin.classes && type.mixin.classes.indexOf(c) !== -1) return true
-			c = c.prototype.__proto__.constructor
+			c = Object.getPrototypeOf(c.prototype).constructor
 		}
 	}
 	return false