diff --git a/CHANGELOG.md b/CHANGELOG.md
index a37e1e0..7de6738 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Fixed ref labels on PRs using PR head branch instead of base
 
 ## [0.0.8] - 2024-03-16
 ### Added
diff --git a/collector.go b/collector.go
index e08a4cb..a12060b 100644
--- a/collector.go
+++ b/collector.go
@@ -259,11 +259,11 @@ func makeRef(run *github.WorkflowRun) string {
 		}
 
 		for _, pr := range run.PullRequests {
-			prBaseBranch := pr.GetBase()
+			prHeadBranch := pr.GetHead()
 
-			if prBaseBranch.GetSHA() == headSha ||
-				prBaseBranch.GetRef() == headBranch {
-				return headBranch
+			if prHeadBranch.GetSHA() == headSha ||
+				prHeadBranch.GetRef() == headBranch {
+				return pr.GetBase().GetRef()
 			}
 		}