diff --git a/index.js b/index.js
index 0bab158..ce117bb 100644
--- a/index.js
+++ b/index.js
@@ -56,6 +56,11 @@ if (argv.watch) {
   process.stdin.resume()
 }
 
+/* istanbul ignore next */
+if (parseInt(postcss().version) < 8) {
+  error('Please install PostCSS 8 or above')
+}
+
 Promise.resolve()
   .then(() => {
     if (argv.watch && !(argv.output || argv.replace || argv.dir)) {