diff --git a/llmproxymetrics.go b/llmproxymetrics.go
index efd8c3c..dd54bc7 100644
--- a/llmproxymetrics.go
+++ b/llmproxymetrics.go
@@ -99,7 +99,7 @@ var opsProcessed = promauto.NewCounter(prometheus.CounterOpts{
 	Help: "The total number of processed events",
 })
 
-var tokens_out = prometheus.NewHistogram(prometheus.HistogramOpts{
+var tokens_out = promauto.NewHistogram(prometheus.HistogramOpts{
 	Name:    "llmproxymetrics_tokens_out",
 	Help:    "Tokens generated.",
 	Buckets: prometheus.LinearBuckets(0, 100, 25),