diff --git a/src/main.ts b/src/main.ts
index 463e7f1..0aefbb0 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,7 +2,7 @@ import * as fs from 'fs'
 import * as core from '@actions/core'
 import * as github from '@actions/github'
 import {GetResponseDataTypeFromEndpointMethod} from '@octokit/types'
-import {PushEvent, PullRequestEvent, MergeGroupEvent} from '@octokit/webhooks-types'
+import {MergeGroupEvent, PullRequest, PushEvent} from '@octokit/webhooks-types'
 
 import {
   isPredicateQuantifier,
@@ -97,7 +97,7 @@ async function getChangedFiles(token: string, base: string, ref: string, initial
       if (base) {
         core.warning(`'base' input parameter is ignored when action is triggered by pull request event`)
       }
-      const pr = github.context.payload as PullRequestEvent
+      const pr = github.context.payload.pull_request as PullRequest
       if (token) {
         return await getChangedFilesFromApi(token, pr)
       }
@@ -193,7 +193,7 @@ async function getChangedFilesFromGit(base: string, head: string, initialFetchDe
 }
 
 // Uses github REST api to get list of files changed in PR
-async function getChangedFilesFromApi(token: string, pullRequest: PullRequestEvent): Promise<File[]> {
+async function getChangedFilesFromApi(token: string, pullRequest: PullRequest): Promise<File[]> {
   core.startGroup(`Fetching list of changed files for PR#${pullRequest.number} from Github API`)
   try {
     const client = github.getOctokit(token)