diff --git a/SAM.cpp b/SAM.cpp
index 697c19c5..c3b4faf1 100644
--- a/SAM.cpp
+++ b/SAM.cpp
@@ -693,9 +693,9 @@ namespace client
 		LogPrint (eLogDebug, "SAM: datagram received ", len);
 		auto base64 = from.ToBase64 ();
 #ifdef _MSC_VER
-		size_t l = sprintf_s ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (int)len); 	
+		size_t l = sprintf_s ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (long unsigned int)len); 	
 #else			
-		size_t l = snprintf ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (int)len); 	
+		size_t l = snprintf ((char *)m_StreamBuffer, SAM_SOCKET_BUFFER_SIZE, SAM_DATAGRAM_RECEIVED, base64.c_str (), (long unsigned int)len); 	
 #endif
 		if (len < SAM_SOCKET_BUFFER_SIZE - l)	
 		{