diff --git a/app/vmselect/promql/eval.go b/app/vmselect/promql/eval.go
index f79331644..934d33c63 100644
--- a/app/vmselect/promql/eval.go
+++ b/app/vmselect/promql/eval.go
@@ -1274,7 +1274,7 @@ type timeseriesByWorkerID struct {
 func (tsw *timeseriesByWorkerID) reset() {
 	byWorkerID := tsw.byWorkerID
 	for i := range byWorkerID {
-		tsw.byWorkerID[i].tss = nil
+		byWorkerID[i].tss = nil
 	}
 }