diff --git a/lib/index.js b/lib/index.js
index 2e8fe52..78b19c4 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -326,7 +326,7 @@ const command = cli.command('csso [input]')
         options = processOptions(options, args);
 
         if (options === null) {
-            this.showHelp();
+            this.outputHelp();
             return;
         }