diff --git a/dist/index.js b/dist/index.js
index b2664c6..504c803 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -33592,7 +33592,9 @@ class Vet {
         if (process.env.GITHUB_REPOSITORY === fullName) {
             return process.env.GITHUB_HEAD_REF;
         }
-        return fullName.replaceAll('/', ':');
+        const remoteOwner = fullName.split('/')[0];
+        const remoteBranch = github_1.context.payload.pull_request?.head?.ref;
+        return `${remoteOwner}:${remoteBranch}`;
     }
     isSupportedLockfile(filename) {
         const baseFileName = path_1.default.basename(filename);
diff --git a/src/vet.ts b/src/vet.ts
index 61f7236..388a0d6 100644
--- a/src/vet.ts
+++ b/src/vet.ts
@@ -523,7 +523,10 @@ export class Vet {
       return process.env.GITHUB_HEAD_REF as string
     }
 
-    return fullName.replaceAll('/', ':')
+    const remoteOwner = fullName.split('/')[0]
+    const remoteBranch = context.payload.pull_request?.head?.ref as string
+
+    return `${remoteOwner}:${remoteBranch}`
   }
 
   private isSupportedLockfile(filename: string): boolean {