diff --git a/acme/acme_test.go b/acme/acme_test.go
index b44af59..89f2efa 100644
--- a/acme/acme_test.go
+++ b/acme/acme_test.go
@@ -946,7 +946,7 @@ func TestNonce_add(t *testing.T) {
 	c.addNonce(http.Header{"Replay-Nonce": {}})
 	c.addNonce(http.Header{"Replay-Nonce": {"nonce"}})
 
-	nonces := map[string]struct{}{"nonce": struct{}{}}
+	nonces := map[string]struct{}{"nonce": {}}
 	if !reflect.DeepEqual(c.nonces, nonces) {
 		t.Errorf("c.nonces = %q; want %q", c.nonces, nonces)
 	}
diff --git a/ocsp/ocsp.go b/ocsp/ocsp.go
index 5e73146..589dfd3 100644
--- a/ocsp/ocsp.go
+++ b/ocsp/ocsp.go
@@ -760,7 +760,7 @@ func CreateResponse(issuer, responderCert *x509.Certificate, template Response,
 	}
 	if template.Certificate != nil {
 		response.Certificates = []asn1.RawValue{
-			asn1.RawValue{FullBytes: template.Certificate.Raw},
+			{FullBytes: template.Certificate.Raw},
 		}
 	}
 	responseDER, err := asn1.Marshal(response)
diff --git a/ocsp/ocsp_test.go b/ocsp/ocsp_test.go
index 1fadfec..70b1976 100644
--- a/ocsp/ocsp_test.go
+++ b/ocsp/ocsp_test.go
@@ -218,7 +218,7 @@ func TestOCSPResponse(t *testing.T) {
 
 	extensionBytes, _ := hex.DecodeString(ocspExtensionValueHex)
 	extensions := []pkix.Extension{
-		pkix.Extension{
+		{
 			Id:       ocspExtensionOID,
 			Critical: false,
 			Value:    extensionBytes,
diff --git a/pkcs12/internal/rc2/rc2.go b/pkcs12/internal/rc2/rc2.go
index 8c70902..7499e3f 100644
--- a/pkcs12/internal/rc2/rc2.go
+++ b/pkcs12/internal/rc2/rc2.go
@@ -122,7 +122,6 @@ func (c *rc2Cipher) Encrypt(dst, src []byte) {
 	r3 = r3 + c.k[r2&63]
 
 	for j <= 40 {
-
 		// mix r0
 		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
 		r0 = rotl16(r0, 1)
@@ -151,7 +150,6 @@ func (c *rc2Cipher) Encrypt(dst, src []byte) {
 	r3 = r3 + c.k[r2&63]
 
 	for j <= 60 {
-
 		// mix r0
 		r0 = r0 + c.k[j] + (r3 & r2) + ((^r3) & r1)
 		r0 = rotl16(r0, 1)
@@ -244,7 +242,6 @@ func (c *rc2Cipher) Decrypt(dst, src []byte) {
 	r0 = r0 - c.k[r3&63]
 
 	for j >= 0 {
-
 		// unmix r3
 		r3 = rotl16(r3, 16-5)
 		r3 = r3 - c.k[j] - (r2 & r1) - ((^r2) & r0)
diff --git a/pkcs12/internal/rc2/rc2_test.go b/pkcs12/internal/rc2/rc2_test.go
index 8a49dfa..51a7efe 100644
--- a/pkcs12/internal/rc2/rc2_test.go
+++ b/pkcs12/internal/rc2/rc2_test.go
@@ -11,7 +11,6 @@ import (
 )
 
 func TestEncryptDecrypt(t *testing.T) {
-
 	// TODO(dgryski): add the rest of the test vectors from the RFC
 	var tests = []struct {
 		key    string
diff --git a/sha3/sha3_test.go b/sha3/sha3_test.go
index 312e8f9..2c8719b 100644
--- a/sha3/sha3_test.go
+++ b/sha3/sha3_test.go
@@ -202,7 +202,7 @@ func TestSqueezing(t *testing.T) {
 			d1 := newShakeHash()
 			d1.Write([]byte(testString))
 			var multiple []byte
-			for _ = range ref {
+			for range ref {
 				one := make([]byte, 1)
 				d1.Read(one)
 				multiple = append(multiple, one...)
diff --git a/ssh/certs.go b/ssh/certs.go
index b1f0220..5c9fadc 100644
--- a/ssh/certs.go
+++ b/ssh/certs.go
@@ -343,7 +343,7 @@ func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
 		return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial)
 	}
 
-	for opt, _ := range cert.CriticalOptions {
+	for opt := range cert.CriticalOptions {
 		// sourceAddressCriticalOption will be enforced by
 		// serverAuthenticate
 		if opt == sourceAddressCriticalOption {
diff --git a/ssh/session.go b/ssh/session.go
index cc06e03..d3321f6 100644
--- a/ssh/session.go
+++ b/ssh/session.go
@@ -406,7 +406,7 @@ func (s *Session) Wait() error {
 		s.stdinPipeWriter.Close()
 	}
 	var copyError error
-	for _ = range s.copyFuncs {
+	for range s.copyFuncs {
 		if err := <-s.errors; err != nil && copyError == nil {
 			copyError = err
 		}
diff --git a/ssh/test/banner_test.go b/ssh/test/banner_test.go
index f1ad469..d3b21ac 100644
--- a/ssh/test/banner_test.go
+++ b/ssh/test/banner_test.go
@@ -8,7 +8,6 @@ package test
 
 import (
 	"testing"
-
 )
 
 func TestBannerCallbackAgainstOpenSSH(t *testing.T) {