diff --git a/encoder.go b/encoder.go
index e3b9199..42734d4 100644
--- a/encoder.go
+++ b/encoder.go
@@ -66,7 +66,7 @@ func (e encoder) defaultEncode(num uint128) string { // compiler optimizes a lot
 func (e encoder) encode(num uint128) string {
 	var r, ind uint64
 	i := int(e.alphabet.encLen - 1)
-	buf := make([]byte, int64(e.alphabet.encLen*e.alphabet.maxBytes))
+	buf := make([]byte, int64(e.alphabet.encLen)*int64(e.alphabet.maxBytes))
 	lastPlaced := len(buf)
 	l := uint64(e.alphabet.len)
 	d, n := maxPow(l)
diff --git a/shortuuid.go b/shortuuid.go
index ee7bfcd..daad857 100644
--- a/shortuuid.go
+++ b/shortuuid.go
@@ -61,8 +61,7 @@ func hashedUUID(space uuid.UUID, data string) (u uuid.UUID) {
 	h := sha1.New()
 	h.Write(space[:])                                         //nolint:errcheck
 	h.Write(unsafe.Slice(unsafe.StringData(data), len(data))) //nolint:errcheck
-	buf := make([]byte, 0, sha1.Size)
-	s := h.Sum(buf)
+	s := h.Sum(make([]byte, 0, sha1.Size))
 	copy(u[:], s)
 	u[6] = (u[6] & 0x0f) | uint8((5&0xf)<<4)
 	u[8] = (u[8] & 0x3f) | 0x80 // RFC 4122 variant