diff --git a/lib/cli/cli.js b/lib/cli/cli.js
index bfe3b2d51..4bb83130e 100644
--- a/lib/cli/cli.js
+++ b/lib/cli/cli.js
@@ -1009,6 +1009,8 @@ module.exports.parseCommandLine = function parseCommandLine() {
       group: 'Crawler'
     })
     .option('crawler.ignoreRobotsTxt', {
+      type: 'boolean',
+      default: false,
       describe: 'Ignore robots.txt rules of the crawled domain.',
       group: 'Crawler'
     });