diff --git a/server/rest/index.js b/server/rest/index.js
index 028d5fb4..397472cd 100644
--- a/server/rest/index.js
+++ b/server/rest/index.js
@@ -12,7 +12,7 @@ const markdown = require(DIR + 'markdown');
 const jaguar = require('jaguar');
 const onezip = require('onezip');
 const inly = require('inly');
-const currify = require('currify/legacy');
+const wraptile = require('wraptile/legacy');
 const pullout = require('pullout/legacy');
 const json = require('jonny/legacy');
 const ponse = require('ponse');
@@ -21,7 +21,7 @@ const check = require('checkup');
 
 const moveFiles = require('./move-files');
 
-const swap = currify((fn, a, b) => fn(b, a));
+const swap = wraptile((fn, a, b) => fn(b, a));
 const isWin32 = process.platform === 'win32';
 
 /**
diff --git a/server/rest/move-files.js b/server/rest/move-files.js
index 34136c39..bcb5883b 100644
--- a/server/rest/move-files.js
+++ b/server/rest/move-files.js
@@ -2,39 +2,42 @@
 
 const path = require('path');
 const flop = require('flop');
-const check = require('checkup');
 const promisify = require('es6-promisify').promisify;
 
 const move = promisify(flop.move);
 
 module.exports = (files, callback) => {
+    check(files, callback);
+    
     if (!files.names)
         return move(files.from, files.to)
             .then(callback)
             .catch(callback);
     
     const names = files.names.slice();
-    const copy = () => {
+    const iterate = () => {
         const isLast = !names.length;
         
         if (isLast)
-            return callback(null);
+            return callback();
         
         const name = names.shift();
         const from = path.join(files.from, name);
         const to = path.join(files.to, name);
         
         move(from, to)
-            .then(copy)
+            .then(iterate)
             .catch(callback);
     };
     
-    check
-        .type('callback', callback, 'function')
-        .check({
-            files,
-        });
-    
-    copy();
+    iterate();
 };
 
+function check(files, callback) {
+    if (typeof files !== 'object')
+        throw Error('files should be an object!');
+    
+    if (typeof callback !== 'function')
+        throw Error('callback should be a function!');
+}
+