diff --git a/lib/config.js b/lib/config.js
index 8f66a364..e2235ee7 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -1416,11 +1416,10 @@ util.extendDeep = function(mergeInto) {
       }
 
       // Copy property descriptor otherwise, preserving accessors
-      else {
-        var descriptor = Object.getOwnPropertyDescriptor(Object(mergeFrom), prop);
-        if (descriptor) {
-          Object.defineProperty(mergeInto, prop, descriptor);
-        }
+      else if (Object.getOwnPropertyDescriptor(Object(mergeFrom), prop)){
+          Object.defineProperty(mergeInto, prop, Object.getOwnPropertyDescriptor(Object(mergeFrom), prop));
+      } else {
+          mergeInto[prop] = mergeFrom[prop];
       }
     }
   });