diff --git a/README.md b/README.md
index 0103f86..2a0a36e 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![PyPI version shields.io](https://img.shields.io/pypi/v/vien.svg)](https://pypi.python.org/pypi/vien/)
 [![Actions Status](https://github.com/rtmigo/vien/workflows/unit%20test/badge.svg?branch=master)](https://github.com/rtmigo/vien/actions)
 [![Actions Status](https://github.com/rtmigo/vien/workflows/pkg%20test/badge.svg?branch=master)](https://github.com/rtmigo/vien/actions)
-[![Generic badge](https://img.shields.io/badge/OS-MacOS,_Ubuntu-blue.svg)](#)
+[![Generic badge](https://img.shields.io/badge/OS-MacOS%20|%20Ubuntu-blue.svg)](#)
 [![Generic badge](https://img.shields.io/badge/Python-3.7--3.9-blue.svg)](#)
 
 **VIEN** is a command-line tool for managing [Python Virtual Environments](https://docs.python.org/3/library/venv.html).