diff --git a/dist/index.js b/dist/index.js
index 186572b89..6d6d54c53 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -59628,7 +59628,7 @@ var buildExec = function () {
     }
     else if ("" + context.eventName == 'pull_request' ||
         "" + context.eventName == 'pull_request_target') {
-        execArgs.push('-C', "" + context.pull_request.head.sha);
+        execArgs.push('-C', "" + context.payload.pull_request.head.sha);
     }
     if (overridePr) {
         execArgs.push('-P', "" + overridePr);
diff --git a/src/buildExec.ts b/src/buildExec.ts
index fcb92738c..95ff21685 100644
--- a/src/buildExec.ts
+++ b/src/buildExec.ts
@@ -137,7 +137,7 @@ const buildExec = () => {
     `${context.eventName}` == 'pull_request' ||
     `${context.eventName}` == 'pull_request_target'
   ) {
-    execArgs.push('-C', `${context.pull_request.head.sha}`);
+    execArgs.push('-C', `${context.payload.pull_request.head.sha}`);
   }
   if (overridePr) {
     execArgs.push('-P', `${overridePr}`);