diff --git a/index.js b/index.js
index f2346bd..7d4452e 100644
--- a/index.js
+++ b/index.js
@@ -5,5 +5,5 @@ module.exports = robot => {
 	// For more information on building apps:
 	// https://probot.github.io/docs/
 	robot.on('pull_request.opened', commitlint)
-	robot.on('pull_request.edited', commitlint)
+	robot.on('pull_request.synchronize', commitlint)
 }