--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/OptimisticTypesCalculator.java	Wed Jul 05 22:07:34 2017 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/OptimisticTypesCalculator.java	Wed Aug 24 14:02:41 2016 +0530
@@ -79,7 +79,7 @@
 
     @Override
     public boolean enterPropertyNode(final PropertyNode propertyNode) {
-        if(propertyNode.getKeyName().equals(ScriptObject.PROTO_PROPERTY_NAME)) {
+        if(ScriptObject.PROTO_PROPERTY_NAME.equals(propertyNode.getKeyName())) {
             tagNeverOptimistic(propertyNode.getValue());
         }
         return super.enterPropertyNode(propertyNode);