diff --git a/src/Three.js b/src/Three.js
index 2ce52291a583cb48a70379fd7b6a1809a6aaeaed..cdef947c66b35e3e718050a3e02bc0d2823c91d9 100644
--- a/src/Three.js
+++ b/src/Three.js
@@ -38,7 +38,7 @@ if ( Math.sign === undefined ) {
 
 }
 
-if ( Function.prototype.name === undefined && Object.defineProperty !== undefined ) {
+if ( Function.prototype.name === undefined ) {
 
 	// Missing in IE9-11.
 	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name