diff --git a/promql/engine.go b/promql/engine.go
index cf60f477af..2f7dcb222e 100644
--- a/promql/engine.go
+++ b/promql/engine.go
@@ -1081,8 +1081,6 @@ type EvalNodeHelper struct {
 	Out Vector
 
 	// Caches.
-	// label_*.
-	Dmn map[uint64]labels.Labels
 	// funcHistogramQuantile for classic histograms.
 	signatureToMetricWithBuckets map[string]*metricWithBuckets