diff --git a/TunnelEndpoint.cpp b/TunnelEndpoint.cpp
index 1bc8a937..e2a0843e 100644
--- a/TunnelEndpoint.cpp
+++ b/TunnelEndpoint.cpp
@@ -205,7 +205,7 @@ namespace tunnel
 			if (it->second.fragmentNum == msg.nextFragmentNum)
 			{
 				LogPrint (eLogWarning, "TunnelMessage: Out-of-sequence fragment ", (int)it->second.fragmentNum, " of message ", msgID, " found");
-				auto size = it->second.data->GetLength ();
+				size_t size = it->second.data->GetLength ();
 				if (msg.data->len + size > msg.data->maxLen)
 				{
 					LogPrint (eLogWarning, "TunnelMessage: Tunnel endpoint I2NP message size ", msg.data->maxLen, " is not enough");
@@ -235,7 +235,7 @@ namespace tunnel
 			LogPrint (eLogInfo, "TunnelMessage: message expired");
 			return;
 		}	
-		auto typeID = msg.data->GetTypeID ();
+		uint8_t typeID = msg.data->GetTypeID ();
 		LogPrint (eLogDebug, "TunnelMessage: handle fragment of ", msg.data->GetLength (), " bytes, msg type ", (int)typeID);
 		// catch RI or reply with new list of routers	
 		if ((IsRouterInfoMsg (msg.data) || typeID == eI2NPDatabaseSearchReply) &&
diff --git a/TunnelGateway.cpp b/TunnelGateway.cpp
index 3383010b..d701e24b 100644
--- a/TunnelGateway.cpp
+++ b/TunnelGateway.cpp
@@ -49,7 +49,7 @@ namespace tunnel
 
 		// create fragments
 		std::shared_ptr<I2NPMessage> msg = block.data;
-		auto fullMsgLen = diLen + msg->GetLength () + 2; // delivery instructions + payload + 2 bytes length
+		size_t fullMsgLen = diLen + msg->GetLength () + 2; // delivery instructions + payload + 2 bytes length
 		if (fullMsgLen <= m_RemainingSize)
 		{
 			// message fits. First and last fragment
@@ -66,10 +66,10 @@ namespace tunnel
 		{
 			if (!messageCreated) // check if we should complete previous message
 			{	
-				auto numFollowOnFragments = fullMsgLen / TUNNEL_DATA_MAX_PAYLOAD_SIZE;
+				size_t numFollowOnFragments = fullMsgLen / TUNNEL_DATA_MAX_PAYLOAD_SIZE;
 				// length of bytes don't fit full tunnel message
 				// every follow-on fragment adds 7 bytes
-				auto nonFit = (fullMsgLen + numFollowOnFragments*7) % TUNNEL_DATA_MAX_PAYLOAD_SIZE; 
+				size_t nonFit = (fullMsgLen + numFollowOnFragments*7) % TUNNEL_DATA_MAX_PAYLOAD_SIZE; 
 				if (!nonFit || nonFit > m_RemainingSize)
 				{
 					CompleteCurrentTunnelDataMessage ();