diff --git a/search/collectors/bench_test.go b/search/collectors/bench_test.go
index cddf5e7f..43ceb764 100644
--- a/search/collectors/bench_test.go
+++ b/search/collectors/bench_test.go
@@ -10,7 +10,9 @@ import (
 	"golang.org/x/net/context"
 )
 
-func benchHelper(numOfMatches int, collector search.Collector, b *testing.B) {
+type createCollector func() search.Collector
+
+func benchHelper(numOfMatches int, cc createCollector, b *testing.B) {
 	matches := make([]*search.DocumentMatch, 0, numOfMatches)
 	for i := 0; i < numOfMatches; i++ {
 		matches = append(matches, &search.DocumentMatch{
@@ -25,6 +27,7 @@ func benchHelper(numOfMatches int, collector search.Collector, b *testing.B) {
 		searcher := &stubSearcher{
 			matches: matches,
 		}
+		collector := cc()
 		err := collector.Collect(context.Background(), searcher, &stubReader{})
 		if err != nil {
 			b.Fatal(err)
diff --git a/search/collectors/collector_heap_test.go b/search/collectors/collector_heap_test.go
index 69bbf46a..fad0fe04 100644
--- a/search/collectors/collector_heap_test.go
+++ b/search/collectors/collector_heap_test.go
@@ -401,17 +401,25 @@ func TestPaginationSameScores(t *testing.T) {
 }
 
 func BenchmarkTop10of100000Scores(b *testing.B) {
-	benchHelper(10000, NewHeapCollector(10, 0, search.SortOrder{&search.SortScore{Desc: true}}), b)
+	benchHelper(10000, func() search.Collector {
+		return NewHeapCollector(10, 0, search.SortOrder{&search.SortScore{Desc: true}})
+	}, b)
 }
 
 func BenchmarkTop100of100000Scores(b *testing.B) {
-	benchHelper(10000, NewHeapCollector(100, 0, search.SortOrder{&search.SortScore{Desc: true}}), b)
+	benchHelper(10000, func() search.Collector {
+		return NewHeapCollector(100, 0, search.SortOrder{&search.SortScore{Desc: true}})
+	}, b)
 }
 
 func BenchmarkTop10of1000000Scores(b *testing.B) {
-	benchHelper(100000, NewHeapCollector(10, 0, search.SortOrder{&search.SortScore{Desc: true}}), b)
+	benchHelper(100000, func() search.Collector {
+		return NewHeapCollector(10, 0, search.SortOrder{&search.SortScore{Desc: true}})
+	}, b)
 }
 
 func BenchmarkTop100of1000000Scores(b *testing.B) {
-	benchHelper(100000, NewHeapCollector(100, 0, search.SortOrder{&search.SortScore{Desc: true}}), b)
+	benchHelper(100000, func() search.Collector {
+		return NewHeapCollector(100, 0, search.SortOrder{&search.SortScore{Desc: true}})
+	}, b)
 }