diff --git a/README.md b/README.md
index 5bfe8c92e..8bde9f6ef 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,7 @@ jobs:
     - uses: actions/labeler@v4
       with:
         repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        label-fork: "${{ secrets.LABEL_FORK }}"
 ```
 
 _Note: This grants access to the `GITHUB_TOKEN` so the action can make calls to GitHub's rest API_
diff --git a/action.yml b/action.yml
index 92496a4d6..2fb060ee2 100644
--- a/action.yml
+++ b/action.yml
@@ -13,6 +13,10 @@ inputs:
     description: 'Whether or not to remove labels when matching files are reverted'
     default: 'false'
     required: false
+  label-fork:
+    description: 'Label fork'
+    default: 'false'
+    required: false
 
 runs:
   using: 'node16'
diff --git a/dist/index.js b/dist/index.js
index cb0f54f90..1977ede03 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -54,11 +54,17 @@ function stringToBoolean(input) {
     return input.toLowerCase() === 'true' || input === '1';
 }
 function run() {
+    var _a;
     return __awaiter(this, void 0, void 0, function* () {
         try {
             const token = core.getInput("repo-token", { required: true });
             const configPath = core.getInput("configuration-path", { required: true });
             const syncLabels = stringToBoolean(core.getInput("sync-labels", { required: false }));
+            const labelFork = stringToBoolean(core.getInput("label-fork", { required: false }));
+            if (!labelFork && ((_a = github.context.payload.repository) === null || _a === void 0 ? void 0 : _a.fork)) {
+                console.log("Workflow is not configured to label forks, exiting");
+                return;
+            }
             const prNumber = getPrNumber();
             if (!prNumber) {
                 console.log("Could not get pull request number from context, exiting");
diff --git a/package.json b/package.json
index 5f6995dd7..72c013078 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "labeler",
-  "version": "4.1.2",
+  "version": "5.0.0",
   "description": "Labels pull requests by files altered",
   "main": "lib/main.js",
   "scripts": {
diff --git a/src/labeler.ts b/src/labeler.ts
index 152cce1fc..ba2c2e853 100644
--- a/src/labeler.ts
+++ b/src/labeler.ts
@@ -27,6 +27,12 @@ export async function run() {
     const token = core.getInput("repo-token", { required: true });
     const configPath = core.getInput("configuration-path", { required: true });
     const syncLabels = stringToBoolean(core.getInput("sync-labels", { required: false }));
+    const labelFork = stringToBoolean(core.getInput("label-fork", { required: false }));
+
+    if (!labelFork && github.context.payload.repository?.fork) {
+      console.log("Workflow is not configured to label forks, exiting");
+      return;
+    }
 
     const prNumber = getPrNumber();
     if (!prNumber) {