diff --git a/library/modules/_wks-define.js b/library/modules/_wks-define.js
index e69603286d8f..1c282269fb39 100644
--- a/library/modules/_wks-define.js
+++ b/library/modules/_wks-define.js
@@ -4,6 +4,6 @@ var global         = require('./_global')
   , wksExt         = require('./_wks-ext')
   , defineProperty = require('./_object-dp').f;
 module.exports = function(name){
-  var $Symbol = core.Symbol || (core.Symbol = LIBRARY ? {} : global.Symbol || {});
+  var $Symbol = core.Symbol || (core.Symbol == LIBRARY ? {} : global.Symbol || {});
   if(name.charAt(0) != '_' && !(name in $Symbol))defineProperty($Symbol, name, {value: wksExt.f(name)});
 };
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