diff --git a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
index 9959d33..54a9b62 100644
--- a/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
+++ b/src/main/java/com/palnet/server/encrptn/kisa/KISA_SHA256.java
@@ -174,7 +174,8 @@ public class KISA_SHA256 {
 		int i, Index;
 
 		Index = Common.URShift(Info.uLowLength, 3) % SHA256_DIGEST_BLOCKLEN;
-		Info.szBuffer[Index++] = (byte)0x80;
+		Info.szBuffer[Index] = (byte)0x80;
+		Index++;
 
 		if (Index > SHA256_DIGEST_BLOCKLEN - 8) {
 			Common.arrayinit_offset(Info.szBuffer, Index, (byte)0, SHA256_DIGEST_BLOCKLEN - Index);