diff --git a/lib/slack.js b/lib/slack.js
index b76fc7619..2a04df938 100644
--- a/lib/slack.js
+++ b/lib/slack.js
@@ -29,8 +29,15 @@ class Slack extends webhook_1.IncomingWebhook {
         const context = github.context;
         const { sha, eventName, workflow, ref } = context;
         const { owner, repo } = context.repo;
+        const { number } = context.issue;
         const repo_url = `https://github.com/${owner}/${repo}`;
-        const action_url = `${repo_url}/commit/${sha}/checks`;
+        let action_url = repo_url;
+        if (eventName === 'pull_request') {
+            action_url += `/pull/${number}/checks`;
+        }
+        else {
+            action_url += `/commit/${sha}/checks`;
+        }
         const blocks = {
             type: 'section',
             fields: [
diff --git a/src/slack.ts b/src/slack.ts
index 4576dfe14..865e3205b 100644
--- a/src/slack.ts
+++ b/src/slack.ts
@@ -29,8 +29,15 @@ export class Slack extends IncomingWebhook {
     const context = github.context;
     const { sha, eventName, workflow, ref } = context;
     const { owner, repo } = context.repo;
+    const { number } = context.issue;
     const repo_url: string = `https://github.com/${owner}/${repo}`;
-    const action_url: string = `${repo_url}/commit/${sha}/checks`;
+    let action_url: string = repo_url;
+
+    if (eventName === 'pull_request') {
+      action_url += `/pull/${number}/checks`
+    } else {
+      action_url += `/commit/${sha}/checks`;
+    }
 
     const blocks: SectionBlock = {
       type: 'section',