diff --git a/pkg/api/minioapi/range.go b/pkg/api/minioapi/range.go
index 885090bee..0c4f3793b 100644
--- a/pkg/api/minioapi/range.go
+++ b/pkg/api/minioapi/range.go
@@ -17,6 +17,7 @@
 package minioapi
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -58,28 +59,28 @@ func newRange(req *http.Request, size int64) (*httpRange, error) {
 // parseRange parses a Range header string as per RFC 2616.
 func (r *httpRange) parseRange(s string) error {
 	if s == "" {
-		return fmt.Errorf("header not present")
+		return errors.New("header not present")
 	}
 	if !strings.HasPrefix(s, b) {
-		return fmt.Errorf("invalid range")
+		return errors.New("invalid range")
 	}
 
 	ras := strings.Split(s[len(b):], ",")
 	if len(ras) == 0 {
-		return fmt.Errorf("invalid request")
+		return errors.New("invalid request")
 	}
 	// Just pick the first one and ignore the rest, we only support one range per object
 	if len(ras) > 1 {
-		return fmt.Errorf("multiple ranges specified")
+		return errors.New("multiple ranges specified")
 	}
 
 	ra := strings.TrimSpace(ras[0])
 	if ra == "" {
-		return fmt.Errorf("invalid range")
+		return errors.New("invalid range")
 	}
 	i := strings.Index(ra, "-")
 	if i < 0 {
-		return fmt.Errorf("invalid range")
+		return errors.New("invalid range")
 	}
 	start, end := strings.TrimSpace(ra[:i]), strings.TrimSpace(ra[i+1:])
 	if start == "" {
@@ -87,7 +88,7 @@ func (r *httpRange) parseRange(s string) error {
 		// range start relative to the end of the file.
 		i, err := strconv.ParseInt(end, 10, 64)
 		if err != nil {
-			return fmt.Errorf("invalid range")
+			return errors.New("invalid range")
 		}
 		if i > r.size {
 			i = r.size
@@ -97,7 +98,7 @@ func (r *httpRange) parseRange(s string) error {
 	} else {
 		i, err := strconv.ParseInt(start, 10, 64)
 		if err != nil || i > r.size || i < 0 {
-			return fmt.Errorf("invalid range")
+			return errors.New("invalid range")
 		}
 		r.start = i
 		if end == "" {
@@ -106,7 +107,7 @@ func (r *httpRange) parseRange(s string) error {
 		} else {
 			i, err := strconv.ParseInt(end, 10, 64)
 			if err != nil || r.start > i {
-				return fmt.Errorf("invalid range")
+				return errors.New("invalid range")
 			}
 			if i >= r.size {
 				i = r.size - 1
diff --git a/pkg/storage/storage_date.go b/pkg/storage/storage_date.go
index 7c6d31ffc..9ee6e55fc 100644
--- a/pkg/storage/storage_date.go
+++ b/pkg/storage/storage_date.go
@@ -1,6 +1,7 @@
 package storage
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -34,7 +35,7 @@ func parseDate(str string) (d Date, err error) {
 		y, m, n int
 	)
 	if len(str) != 10 || str[4] != '-' || str[7] != '-' {
-		err = fmt.Errorf("Invalid 0000-00-000 style DATE string: " + str)
+		err = errors.New("Invalid 0000-00-000 style DATE string: " + str)
 		return
 	}
 	if y, err = strconv.Atoi(str[0:4]); err != nil {
@@ -44,14 +45,14 @@ func parseDate(str string) (d Date, err error) {
 		return
 	}
 	if m < 1 || m > 12 {
-		err = fmt.Errorf("Invalid 0000-00-000 style DATE string: " + str)
+		err = errors.New("Invalid 0000-00-000 style DATE string: " + str)
 		return
 	}
 	if n, err = strconv.Atoi(str[8:10]); err != nil {
 		return
 	}
 	if n < 1 || n > 31 {
-		err = fmt.Errorf("Invalid 0000-00-000 style DATE string: " + str)
+		err = errors.New("Invalid 0000-00-000 style DATE string: " + str)
 		return
 	}
 	d.Year = int16(y)
diff --git a/pkg/utils/crypto/signers/signers.go b/pkg/utils/crypto/signers/signers.go
index 60d9a7397..2692a6360 100644
--- a/pkg/utils/crypto/signers/signers.go
+++ b/pkg/utils/crypto/signers/signers.go
@@ -21,6 +21,7 @@ import (
 	"crypto/hmac"
 	"crypto/sha1"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -55,7 +56,7 @@ func ValidateRequest(user config.User, req *http.Request) (bool, error) {
 	// Verify if date headers are set, if not reject the request
 	if req.Header.Get("x-amz-date") == "" {
 		if req.Header.Get("Date") == "" {
-			return false, fmt.Errorf("Date should be set")
+			return false, errors.New("Date should be set")
 		}
 	}
 	hm := hmac.New(sha1.New, []byte(user.SecretKey))
@@ -73,7 +74,7 @@ func ValidateRequest(user config.User, req *http.Request) (bool, error) {
 	// fmt.Println("Header calculated: ", authHeader.String())
 	// fmt.Printf("%q : %x", ss, ss)
 	if req.Header.Get("Authorization") != authHeader.String() {
-		return false, fmt.Errorf("Authorization header mismatch")
+		return false, errors.New("Authorization header mismatch")
 	}
 	return true, nil
 }
diff --git a/pkg/utils/crypto/x509/generator.go b/pkg/utils/crypto/x509/generator.go
index 5a1ba581c..5366f0bbf 100644
--- a/pkg/utils/crypto/x509/generator.go
+++ b/pkg/utils/crypto/x509/generator.go
@@ -17,6 +17,13 @@
 package x509
 
 import (
+	"errors"
+	"fmt"
+	"math/big"
+	"net"
+	"os"
+	"time"
+
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
@@ -24,11 +31,6 @@ import (
 	"crypto/x509"
 	"crypto/x509/pkix"
 	"encoding/pem"
-	"fmt"
-	"math/big"
-	"net"
-	"os"
-	"time"
 )
 
 // Certificates - based on http://golang.org/src/crypto/tls/generate_cert.go
@@ -91,11 +93,11 @@ func (tls *Certificates) GenerateCertificates(params Params) error {
 	case "P521":
 		priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
 	default:
-		return fmt.Errorf("Unrecognized elliptic curve: %q", params.EcdsaCurve)
+		return errors.New("Unrecognized elliptic curve: %q", params.EcdsaCurve)
 	}
 
 	if err != nil {
-		return fmt.Errorf("failed to generate private key: %s", err)
+		return errors.New("failed to generate private key: %s", err)
 	}
 
 	var notBefore time.Time
@@ -104,7 +106,7 @@ func (tls *Certificates) GenerateCertificates(params Params) error {
 	} else {
 		notBefore, err = time.Parse("Jan 2 15:04:05 2006", params.ValidFrom)
 		if err != nil {
-			return fmt.Errorf("Failed to parse creation date: %s", err)
+			return errors.New("Failed to parse creation date: %s", err)
 		}
 	}
 	notAfter := notBefore.Add(time.Duration(params.ValidFor))
@@ -112,7 +114,7 @@ func (tls *Certificates) GenerateCertificates(params Params) error {
 	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
 	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
 	if err != nil {
-		return fmt.Errorf("failed to generate serial number: %s", err)
+		return errors.New("failed to generate serial number: %s", err)
 	}
 	orgName := pkix.Name{
 		Organization: []string{"Minio"},
@@ -140,7 +142,7 @@ func (tls *Certificates) GenerateCertificates(params Params) error {
 
 	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
 	if err != nil {
-		return fmt.Errorf("Failed to create certificate: %s", err)
+		return errors.New("Failed to create certificate: %s", err)
 	}
 
 	tls.CertPemBlock = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})