diff --git a/lib/browserstack/localbinary.rb b/lib/browserstack/localbinary.rb
index ddd8c04..f883eaa 100644
--- a/lib/browserstack/localbinary.rb
+++ b/lib/browserstack/localbinary.rb
@@ -42,7 +42,7 @@ def download(dest_parent_dir)
     http.verify_mode = OpenSSL::SSL::VERIFY_NONE
 
     res = http.get(uri.path)
-    file = open(binary_path, 'w')
+    file = open(binary_path, 'wb')
     file.write(res.body)
     file.close
     FileUtils.chmod 0755, binary_path