diff --git a/dist/index.js b/dist/index.js
index 72c16629..a7b8fa69 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -3529,6 +3529,7 @@ function run() {
             let base;
             let head;
             switch (eventName) {
+                case 'pull_request_target':
                 case 'pull_request':
                     base = (_b = (_a = github_1.context.payload.pull_request) === null || _a === void 0 ? void 0 : _a.base) === null || _b === void 0 ? void 0 : _b.sha;
                     head = (_d = (_c = github_1.context.payload.pull_request) === null || _c === void 0 ? void 0 : _c.head) === null || _d === void 0 ? void 0 : _d.sha;
@@ -3565,11 +3566,6 @@ function run() {
                 core.setFailed(`The GitHub API for comparing the base and head commits for this ${github_1.context.eventName} event returned ${response.status}, expected 200. ` +
                     "Please submit an issue on this action's GitHub repo.");
             }
-            // Ensure that the head commit is ahead of the base commit.
-            if (response.data.status !== 'ahead') {
-                core.setFailed(`The head commit for this ${github_1.context.eventName} event is not ahead of the base commit. ` +
-                    "Please submit an issue on this action's GitHub repo.");
-            }
             // Get the changed files from the response payload.
             const files = response.data.files;
             const all = [], added = [], modified = [], removed = [], renamed = [], addedModified = [];
diff --git a/src/main.ts b/src/main.ts
index 0f0fdd61..e78d223e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -26,6 +26,7 @@ async function run(): Promise<void> {
     let head: string | undefined
 
     switch (eventName) {
+      case 'pull_request_target':
       case 'pull_request':
         base = context.payload.pull_request?.base?.sha
         head = context.payload.pull_request?.head?.sha
@@ -74,14 +75,6 @@ async function run(): Promise<void> {
       )
     }
 
-    // Ensure that the head commit is ahead of the base commit.
-    if (response.data.status !== 'ahead') {
-      core.setFailed(
-        `The head commit for this ${context.eventName} event is not ahead of the base commit. ` +
-          "Please submit an issue on this action's GitHub repo."
-      )
-    }
-
     // Get the changed files from the response payload.
     const files = response.data.files
     const all = [] as string[],