diff --git a/src/files.ts b/src/files.ts
index 7ad3b37b..0008e744 100644
--- a/src/files.ts
+++ b/src/files.ts
@@ -39,9 +39,7 @@ export async function getPullRequestFiles(): Promise<string[]> {
   const token = getInput("repo-token", { required: true });
   const githubClient = getOctokit(token);
 
-  const pullNumber = (context.payload.issue || context.payload.pull_request || context.payload).number;
-
-  if (!pullNumber) {
+  if (!context.issue.number) {
     throw Error("Unable to get pull request number from action event");
   }