diff --git a/scripts/preview-theme.js b/scripts/preview-theme.js
index f5a24a80a326d..baccaa61a3a78 100644
--- a/scripts/preview-theme.js
+++ b/scripts/preview-theme.js
@@ -46,7 +46,7 @@ const INVALID_REVIEW_COMMENT = (commentUrl) =>
 
 // Retrieve octokit instance.
 const OCTOKIT = github.getOctokit(getGithubToken());
-const PULL_REQUEST_ID = prNumber ? prNumber : getPrNumber();
+const PULL_REQUEST_ID = getPrNumber();
 const { OWNER, REPO } = getRepoInfo(github.context);
 
 /**
@@ -308,7 +308,7 @@ const DRY_RUN = process.env.DRY_RUN === "true" || false;
 /**
  * Main function.
  */
-export const run = async (prNumber) => {
+export const run = async () => {
   try {
     debug("Retrieve action information from context...");
     debug(`Context: ${inspect(github.context)}`);