diff --git a/src/lib/slack.js b/src/lib/slack.js
index 3716351..a4a18e1 100644
--- a/src/lib/slack.js
+++ b/src/lib/slack.js
@@ -53,6 +53,7 @@ export default class Slack {
 
     elements.unshift({
       type: "button",
+      style: "danger",
       text: {
         type: "plain_text",
         text: "Skip",
diff --git a/test/slack.test.js b/test/slack.test.js
index 4f1572c..e8c9e08 100644
--- a/test/slack.test.js
+++ b/test/slack.test.js
@@ -125,6 +125,7 @@ describe("Slack", () => {
           elements: [
             {
               type: "button",
+              style: "danger",
               text: {
                 type: "plain_text",
                 text: "Skip",