diff --git a/src/fmt/scan_test.go b/src/fmt/scan_test.go
index e8c5769924..a4f80c23c2 100644
--- a/src/fmt/scan_test.go
+++ b/src/fmt/scan_test.go
@@ -1096,10 +1096,10 @@ func testScanInts(t *testing.T, scan func(*RecursiveInt, *bytes.Buffer) error) {
 }
 
 func BenchmarkScanInts(b *testing.B) {
-	b.ResetTimer()
+	b.StopTimer()
 	ints := makeInts(intCount)
 	var r RecursiveInt
-	for i := b.N - 1; i >= 0; i-- {
+	for i := 0; i < b.N; i++ {
 		buf := bytes.NewBuffer(ints)
 		b.StartTimer()
 		scanInts(&r, buf)
@@ -1108,10 +1108,10 @@ func BenchmarkScanInts(b *testing.B) {
 }
 
 func BenchmarkScanRecursiveInt(b *testing.B) {
-	b.ResetTimer()
+	b.StopTimer()
 	ints := makeInts(intCount)
 	var r RecursiveInt
-	for i := b.N - 1; i >= 0; i-- {
+	for i := 0; i < b.N; i++ {
 		buf := bytes.NewBuffer(ints)
 		b.StartTimer()
 		Fscan(buf, &r)
@@ -1120,10 +1120,10 @@ func BenchmarkScanRecursiveInt(b *testing.B) {
 }
 
 func BenchmarkScanRecursiveIntReaderWrapper(b *testing.B) {
-	b.ResetTimer()
+	b.StopTimer()
 	ints := makeInts(intCount)
 	var r RecursiveInt
-	for i := b.N - 1; i >= 0; i-- {
+	for i := 0; i < b.N; i++ {
 		buf := struct{ io.Reader }{strings.NewReader(string(ints))}
 		b.StartTimer()
 		Fscan(buf, &r)
diff --git a/src/math/big/int_test.go b/src/math/big/int_test.go
index 2800d8f247..dfbc17242d 100644
--- a/src/math/big/int_test.go
+++ b/src/math/big/int_test.go
@@ -254,7 +254,7 @@ func TestBinomial(t *testing.T) {
 
 func BenchmarkBinomial(b *testing.B) {
 	var z Int
-	for i := b.N - 1; i >= 0; i-- {
+	for i := 0; i < b.N; i++ {
 		z.Binomial(1000, 990)
 	}
 }
@@ -1425,7 +1425,6 @@ func BenchmarkBitset(b *testing.B) {
 	z := new(Int)
 	z.SetBit(z, 512, 1)
 	b.ResetTimer()
-	b.StartTimer()
 	for i := b.N - 1; i >= 0; i-- {
 		z.SetBit(z, i&512, 1)
 	}
@@ -1435,7 +1434,6 @@ func BenchmarkBitsetNeg(b *testing.B) {
 	z := NewInt(-1)
 	z.SetBit(z, 512, 0)
 	b.ResetTimer()
-	b.StartTimer()
 	for i := b.N - 1; i >= 0; i-- {
 		z.SetBit(z, i&512, 0)
 	}
@@ -1445,7 +1443,6 @@ func BenchmarkBitsetOrig(b *testing.B) {
 	z := new(Int)
 	altSetBit(z, z, 512, 1)
 	b.ResetTimer()
-	b.StartTimer()
 	for i := b.N - 1; i >= 0; i-- {
 		altSetBit(z, z, i&512, 1)
 	}
@@ -1455,7 +1452,6 @@ func BenchmarkBitsetNegOrig(b *testing.B) {
 	z := NewInt(-1)
 	altSetBit(z, z, 512, 0)
 	b.ResetTimer()
-	b.StartTimer()
 	for i := b.N - 1; i >= 0; i-- {
 		altSetBit(z, z, i&512, 0)
 	}
diff --git a/src/net/url/url_test.go b/src/net/url/url_test.go
index 577cf631c8..23c5c581c5 100644
--- a/src/net/url/url_test.go
+++ b/src/net/url/url_test.go
@@ -1116,7 +1116,6 @@ func TestResolvePath(t *testing.T) {
 }
 
 func BenchmarkResolvePath(b *testing.B) {
-	b.ResetTimer()
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		resolvePath("a/b/c", ".././d")