diff --git a/lib/util.js b/lib/util.js
index 30ebee42..2bc6aa0b 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -50,7 +50,7 @@
                         name: name
                     });
                     
-                    throw(Error(msg));
+                    throw Error(msg);
                 }
                 
                 return check;
@@ -69,7 +69,7 @@
                 var is = Util.type(arg) === type;
                 
                 if (!is)
-                    throw(Error(name + ' should be ' + type));
+                    throw Error(name + ' should be ' + type);
                 
                 return check;
             };
@@ -283,7 +283,7 @@
             var ret     = [];
             
             if (!Array.isArray(arr))
-                throw(Error('arr should be array!'));
+                throw Error('arr should be array!');
             
             ret = arr.map(function(item) {
                 return item.name;
@@ -302,10 +302,10 @@
             var ret;
             
              if (!Array.isArray(array))
-                throw(Error('array should be array!'));
+                throw Error('array should be array!');
                 
             if (typeof name !== 'string')
-                throw(Error('name should be string!'));
+                throw Error('name should be string!');
             
             array.some(function(item) {
                 var is = item.name === name,