diff --git a/index.js b/index.js
index a427caf..9dcc056 100644
--- a/index.js
+++ b/index.js
@@ -8,7 +8,7 @@ exports = module.exports = core = {};
 core.version = (JSON.parse(fs.readFileSync(__dirname + '/package.json')).version);
 
 core.create_dir = function() {
-  if (!path.existsSync(kpath)) {
+  if (!fs.existsSync(kpath)) {
     fs.mkdir(kpath, 0755, function(err) {
       if (err) throw err;
     });
diff --git a/test.js b/test.js
index 80cf05d..e043c64 100644
--- a/test.js
+++ b/test.js
@@ -8,7 +8,7 @@ var kotoba_file = __dirname + '/.kotoba/' + kotoba.file_name() + '.kotoba'
   , kotoba_file1 = __dirname + '/.kotoba/' + (kotoba.file_name() - 1) + '.kotoba';
 
 var exists = function() {
-  return path.existsSync(kotoba_file);
+  return fs.existsSync(kotoba_file);
 }
 
 var capture_stdout = function(cmd, callback) {