diff --git a/netmap/aggregator.go b/netmap/aggregator.go
index 433a3ba..6926b84 100644
--- a/netmap/aggregator.go
+++ b/netmap/aggregator.go
@@ -72,12 +72,6 @@ func newMinAgg() aggregator {
 	return new(minAgg)
 }
 
-// newMeanIQRAgg returns an aggregator which
-// computes mean value of values from IQR interval.
-func newMeanIQRAgg() aggregator {
-	return new(meanIQRAgg)
-}
-
 // newReverseMinNorm returns a normalizer which
 // normalize values in range of 0.0 to 1.0 to a minimum value.
 func newReverseMinNorm(min float64) normalizer {
@@ -116,6 +110,11 @@ func (a *minAgg) Compute() float64 {
 	return a.min
 }
 
+func (a *meanIQRAgg) clear() {
+	a.k = 0
+	a.arr = a.arr[:0]
+}
+
 func (a *meanIQRAgg) Add(n float64) {
 	a.arr = append(a.arr, n)
 }
diff --git a/netmap/selector.go b/netmap/selector.go
index d57a89d..b16e774 100644
--- a/netmap/selector.go
+++ b/netmap/selector.go
@@ -104,8 +104,10 @@ func (c *context) getSelection(s netmap.Selector) ([]nodes, error) {
 
 	if len(c.hrwSeed) != 0 {
 		weights := make([]float64, len(res))
+		a := new(meanIQRAgg)
 		for i := range res {
-			weights[i] = calcBucketWeight(res[i], newMeanIQRAgg(), c.weightFunc)
+			a.clear()
+			weights[i] = calcBucketWeight(res[i], a, c.weightFunc)
 		}
 
 		hrw.SortHasherSliceByWeightValue(res, weights, c.hrwSeedHash)