diff --git a/I2NPProtocol.cpp b/I2NPProtocol.cpp
index 568cfea4..63f3077b 100644
--- a/I2NPProtocol.cpp
+++ b/I2NPProtocol.cpp
@@ -327,7 +327,7 @@ namespace i2p
 			
 				i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), records[i].encrypted, (uint8_t *)&clearText);
 				// replace record to reply
-				I2NPBuildResponseRecord * reply = (I2NPBuildResponseRecord *)(records + i);				
+				uint8_t * reply = (uint8_t *)(records + i);				
 				if (i2p::context.AcceptsTunnels ())
 				{	
 					i2p::tunnel::TransitTunnel * transitTunnel = 
@@ -337,13 +337,14 @@ namespace i2p
 							clearText.layerKey, clearText.ivKey, 
 							clearText.flag & 0x80, clearText.flag & 0x40);
 					i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
-					reply->ret = 0;
+					reply[BUILD_RESPONSE_RECORD_RET_OFFSET] = 0;
 				}
 				else
-					reply->ret = 30; // always reject with bandwidth reason (30)
+					reply[BUILD_RESPONSE_RECORD_RET_OFFSET] = 30; // always reject with bandwidth reason (30)
 				
 				//TODO: fill filler
-				CryptoPP::SHA256().CalculateDigest(reply->hash, reply->padding, sizeof (reply->padding) + 1); // + 1 byte of ret
+				CryptoPP::SHA256().CalculateDigest(reply + BUILD_RESPONSE_RECORD_HASH_OFFSET, 
+					reply + BUILD_RESPONSE_RECORD_PADDING_OFFSET, BUILD_RESPONSE_RECORD_PADDING_SIZE + 1); // + 1 byte of ret
 				// encrypt reply
 				i2p::crypto::CBCEncryption encryption;
 				for (int j = 0; j < num; j++)
diff --git a/I2NPProtocol.h b/I2NPProtocol.h
index b2fcd495..8393cc15 100644
--- a/I2NPProtocol.h
+++ b/I2NPProtocol.h
@@ -40,15 +40,17 @@ namespace i2p
 	const size_t DATABASE_STORE_TYPE_OFFSET = DATABASE_STORE_KEY_OFFSET + 32;
 	const size_t DATABASE_STORE_REPLY_TOKEN_OFFSET = DATABASE_STORE_TYPE_OFFSET + 1;
 	const size_t DATABASE_STORE_HEADER_SIZE = DATABASE_STORE_REPLY_TOKEN_OFFSET + 4;
-	
-#pragma pack (1)
 
-	/*struct I2NPDatabaseStoreMsg
-	{
-		uint8_t key[32];
-		uint8_t type;
-		uint32_t replyToken;	
-	};*/
+	// TunnelBuild	
+	const size_t TUNNEL_BUILD_RECORD_SIZE = 528;
+	
+	// BuildResponseRecord
+	const size_t BUILD_RESPONSE_RECORD_HASH_OFFSET = 0;
+	const size_t BUILD_RESPONSE_RECORD_PADDING_OFFSET = 32;
+	const size_t BUILD_RESPONSE_RECORD_PADDING_SIZE = 495;
+	const size_t BUILD_RESPONSE_RECORD_RET_OFFSET = BUILD_RESPONSE_RECORD_PADDING_OFFSET + BUILD_RESPONSE_RECORD_PADDING_SIZE;
+		
+#pragma pack (1)
 	
 	struct I2NPBuildRequestRecordClearText
 	{
@@ -65,13 +67,6 @@ namespace i2p
 		uint32_t nextMessageID;	
 		uint8_t filler[29];
 	};
-
-	struct I2NPBuildResponseRecord
-	{
-		uint8_t hash[32];
-		uint8_t padding[495];
-		uint8_t ret;
-	};	
 	
 	struct I2NPBuildRequestRecordElGamalEncrypted
 	{
diff --git a/Tunnel.cpp b/Tunnel.cpp
index e3b2d88d..b8830789 100644
--- a/Tunnel.cpp
+++ b/Tunnel.cpp
@@ -113,9 +113,9 @@ namespace tunnel
 				auto idx = hop1->recordIndex;
 				if (idx >= 0 && idx < msg[0])
 				{	
-					uint8_t * record = msg + 1 + idx*sizeof (I2NPBuildResponseRecord);
+					uint8_t * record = msg + 1 + idx*TUNNEL_BUILD_RECORD_SIZE;
 					decryption.SetIV (hop->replyIV);
-					decryption.Decrypt(record, sizeof (I2NPBuildResponseRecord), record);
+					decryption.Decrypt(record, TUNNEL_BUILD_RECORD_SIZE, record);
 				}	
 				else
 					LogPrint ("Tunnel hop index ", idx, " is out of range");
@@ -128,10 +128,10 @@ namespace tunnel
 		hop = m_Config->GetFirstHop ();
 		while (hop)
 		{			
-			I2NPBuildResponseRecord record;
-			memcpy (&record, msg + 1 + hop->recordIndex*sizeof (I2NPBuildResponseRecord), sizeof (I2NPBuildResponseRecord));
-			LogPrint ("Ret code=", (int)record.ret);
-			if (record.ret) 
+			const uint8_t * record = msg + 1 + hop->recordIndex*TUNNEL_BUILD_RECORD_SIZE;
+			uint8_t ret = record[BUILD_RESPONSE_RECORD_RET_OFFSET];
+			LogPrint ("Ret code=", (int)ret);
+			if (ret) 
 				// if any of participants declined the tunnel is not established
 				established = false; 
 			hop = hop->next;