diff --git a/jwt.go b/jwt.go
index d4f191a..b630593 100644
--- a/jwt.go
+++ b/jwt.go
@@ -217,12 +217,8 @@ func EncodeSegment(seg []byte) string {
 
 // Decode JWT specific base64url encoding with padding stripped
 func DecodeSegment(seg string) ([]byte, error) {
-	// len % 4
-	switch len(seg) % 4 {
-	case 2:
-		seg = seg + "=="
-	case 3:
-		seg = seg + "==="
+	if l := len(seg) % 4; l > 0 {
+		seg += strings.Repeat("=", 4-l)
 	}
 
 	return base64.URLEncoding.DecodeString(seg)