--- a/live/liveMedia/ServerMediaSession.cpp
+++ b/live/liveMedia/ServerMediaSession.cpp
@@ -271,7 +271,7 @@ char* ServerMediaSession::generateSDPDes
 
     char const* const sdpPrefixFmt =
       "v=0\r\n"
-      "o=- %ld%06ld %d IN %s %s\r\n"
+      "o=- %lld%06lld %d IN %s %s\r\n"
       "s=%s\r\n"
       "i=%s\r\n"
       "t=0 0\r\n"