diff --git a/src/hooks/issuePrRef.js b/src/hooks/issuePrRef.js
index 1dcf95b..fe94daf 100644
--- a/src/hooks/issuePrRef.js
+++ b/src/hooks/issuePrRef.js
@@ -13,7 +13,7 @@ module.exports = {
         log(`Try referencing ref ${pull_request.head.ref} to issue`)
 
         const regex = /refs\/heads\/(feature|bugfix)\/ISS-(\d+)-/
-        const issueId = regex.exec(ref)[2]
+        const issueId = regex.exec(pull_request.head.ref)[2]
 
         let body = pull_request.body
         if(body.includes('> <code>')) {