diff --git a/src/com/sinpo/xnfc/nfc/Util.java b/src/com/sinpo/xnfc/nfc/Util.java
index 43c272f..8175ea9 100644
--- a/src/com/sinpo/xnfc/nfc/Util.java
+++ b/src/com/sinpo/xnfc/nfc/Util.java
@@ -106,7 +106,12 @@ public static String toStringR(int n) {
 
 		long N = 0xFFFFFFFFL & n;
 		while (N != 0) {
-			ret.append((int) (N % 100));
+			int temp = (int) (N % 100);
+			if (temp < 10) {
+				ret.append("0").append(temp);
+			} else {
+				ret.append(temp);
+			}
 			N /= 100;
 		}