diff --git a/cmd/csaf_aggregator/config.go b/cmd/csaf_aggregator/config.go
index 7e3c8a3..3943a44 100644
--- a/cmd/csaf_aggregator/config.go
+++ b/cmd/csaf_aggregator/config.go
@@ -86,9 +86,9 @@ type config struct {
 	keyErr error
 }
 
-// TooOldForInterims returns a function that tells if a given
+// tooOldForInterims returns a function that tells if a given
 // time is too old for the configured interims interval.
-func (c *config) TooOldForInterims() func(time.Time) bool {
+func (c *config) tooOldForInterims() func(time.Time) bool {
 	if c.InterimYears <= 0 {
 		return func(time.Time) bool { return false }
 	}
diff --git a/cmd/csaf_aggregator/interim.go b/cmd/csaf_aggregator/interim.go
index 4ca23b8..5b56aab 100644
--- a/cmd/csaf_aggregator/interim.go
+++ b/cmd/csaf_aggregator/interim.go
@@ -173,7 +173,7 @@ func (w *worker) interimWork(wg *sync.WaitGroup, jobs <-chan *interimJob) {
 	defer wg.Done()
 	path := filepath.Join(w.processor.cfg.Web, ".well-known", "csaf-aggregator")
 
-	tooOld := w.processor.cfg.TooOldForInterims()
+	tooOld := w.processor.cfg.tooOldForInterims()
 
 	for j := range jobs {
 		w.setupProviderInterim(j.provider)