diff --git a/lib/utils.js b/lib/utils.js
index 0ef9366..ade8309 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -351,10 +351,8 @@ function merge(/* obj1, obj2, obj3, ... */) {
       result[targetKey] = merge({}, val);
     } else if (isArray(val)) {
       result[targetKey] = val.slice();
-    } else {
-      if (!skipUndefined || !isUndefined(val)) {
-        result[targetKey] = val;
-      }
+    } else if (!skipUndefined || !isUndefined(val)) {
+      result[targetKey] = val;
     }
   }