diff --git a/metrics/metrics.go b/metrics/metrics.go
index ec593ea1..4d3f2a8b 100644
--- a/metrics/metrics.go
+++ b/metrics/metrics.go
@@ -86,7 +86,7 @@ var CarLookupHistogram = promauto.NewHistogramVec(
 		Help:    "Car lookup latency",
 		Buckets: latencyBuckets,
 	},
-	[]string{"car", "is_remote"},
+	[]string{"car", "is_remote", "is_split_car"},
 )
 
 var latencyBuckets = []float64{