diff --git a/spec/ocr_spec.rb b/spec/ocr_spec.rb
index efe9e38..30e9bc2 100644
--- a/spec/ocr_spec.rb
+++ b/spec/ocr_spec.rb
@@ -1,15 +1,17 @@
 require 'spec_helper'
 require 'fileutils'
+require 'tmpdir'
 
 describe 'OCR' do
   before do
+    @tmp_dir = Dir.mktmpdir
     @samples = []
     10.times do
       @samples << SecureRandom.hex(2)
     end
     @filenames = []
     @samples.each do |chars|
-      fname = File.join(File.dirname(__FILE__), "..", "tmp", "#{chars}.png")
+      fname = File.join(@tmp_dir, "#{chars}.png")
       img = RuCaptcha::Captcha.create(chars)
       File.open(fname, 'w+') do |f|
         f.puts img
@@ -19,14 +21,13 @@ describe 'OCR' do
   end
 
   after do
-    path = File.expand_path File.join(File.dirname(__FILE__), '..', 'tmp/*.png')
-    FileUtils.rm_f(path)
+    FileUtils.rm_f(@tmp_dir)
   end
 
   it 'should not read by OCR lib' do
     results = []
     @samples.each do |chars|
-      str = RTesseract.new(File.join(File.dirname(__FILE__), "..", "tmp", "#{chars}.png"), processor: 'mini_magick').to_s
+      str = RTesseract.new(File.join(@tmp_dir, "#{chars}.png"), processor: 'mini_magick').to_s
       results << "- Chars: #{chars}, OCR read #{str.strip}"
       expect(chars).not_to eq(str)
     end