diff --git a/src/encoding/base32/base32.go b/src/encoding/base32/base32.go
index e921887285..d26cb5c685 100644
--- a/src/encoding/base32/base32.go
+++ b/src/encoding/base32/base32.go
@@ -26,9 +26,12 @@ type Encoding struct {
 }
 
 const (
-	StdPadding          rune = '=' // Standard padding character
-	NoPadding           rune = -1  // No padding
-	decodeMapInitialize      = "" +
+	StdPadding rune = '=' // Standard padding character
+	NoPadding  rune = -1  // No padding
+)
+
+const (
+	decodeMapInitialize = "" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
@@ -48,9 +51,6 @@ const (
 	invalidIndex = '\xff'
 )
 
-const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
-const encodeHex = "0123456789ABCDEFGHIJKLMNOPQRSTUV"
-
 // NewEncoding returns a new padded Encoding defined by the given alphabet,
 // which must be a 32-byte string that contains unique byte values and
 // does not contain the padding character or CR / LF ('\r', '\n').
@@ -83,13 +83,12 @@ func NewEncoding(encoder string) *Encoding {
 	return e
 }
 
-// StdEncoding is the standard base32 encoding, as defined in
-// RFC 4648.
-var StdEncoding = NewEncoding(encodeStd)
+// StdEncoding is the standard base32 encoding, as defined in RFC 4648.
+var StdEncoding = NewEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZ234567")
 
 // HexEncoding is the “Extended Hex Alphabet” defined in RFC 4648.
 // It is typically used in DNS.
-var HexEncoding = NewEncoding(encodeHex)
+var HexEncoding = NewEncoding("0123456789ABCDEFGHIJKLMNOPQRSTUV")
 
 // WithPadding creates a new encoding identical to enc except
 // with a specified padding character, or NoPadding to disable padding.
diff --git a/src/encoding/base64/base64.go b/src/encoding/base64/base64.go
index 9445cbd4ef..992f5c243f 100644
--- a/src/encoding/base64/base64.go
+++ b/src/encoding/base64/base64.go
@@ -29,9 +29,12 @@ type Encoding struct {
 }
 
 const (
-	StdPadding          rune = '=' // Standard padding character
-	NoPadding           rune = -1  // No padding
-	decodeMapInitialize      = "" +
+	StdPadding rune = '=' // Standard padding character
+	NoPadding  rune = -1  // No padding
+)
+
+const (
+	decodeMapInitialize = "" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
 		"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" +
@@ -51,9 +54,6 @@ const (
 	invalidIndex = '\xff'
 )
 
-const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
-const encodeURL = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
-
 // NewEncoding returns a new padded Encoding defined by the given alphabet,
 // which must be a 64-byte string that contains unique byte values and
 // does not contain the padding character or CR / LF ('\r', '\n').
@@ -115,13 +115,12 @@ func (enc Encoding) Strict() *Encoding {
 	return &enc
 }
 
-// StdEncoding is the standard base64 encoding, as defined in
-// RFC 4648.
-var StdEncoding = NewEncoding(encodeStd)
+// StdEncoding is the standard base64 encoding, as defined in RFC 4648.
+var StdEncoding = NewEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
 
 // URLEncoding is the alternate base64 encoding defined in RFC 4648.
 // It is typically used in URLs and file names.
-var URLEncoding = NewEncoding(encodeURL)
+var URLEncoding = NewEncoding("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_")
 
 // RawStdEncoding is the standard raw, unpadded base64 encoding,
 // as defined in RFC 4648 section 3.2.
diff --git a/src/encoding/base64/base64_test.go b/src/encoding/base64/base64_test.go
index 6dfdaef1f1..7f5ebd8085 100644
--- a/src/encoding/base64/base64_test.go
+++ b/src/encoding/base64/base64_test.go
@@ -70,6 +70,8 @@ func rawURLRef(ref string) string {
 	return rawRef(urlRef(ref))
 }
 
+const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+
 // A nonstandard encoding with a funny padding character, for testing
 var funnyEncoding = NewEncoding(encodeStd).WithPadding(rune('@'))