PVS-Studio warning V627 for WebRTC

#define CC_MAX_DIALSTRING_LEN (512)

static sm_rcs_t
fsmdef_ev_idle_feature (sm_event_t *event)
{
  ....
  memset(data->newcall.redirect.redirects[0].number, 0,
         sizeof(CC_MAX_DIALSTRING_LEN));
  ....
}

This suspicious code was found in WebRTC project by PVS-Studio static code analyzer.
Warning message is:
V627 Consider inspecting the expression. The argument of sizeof() is the macro which expands to a number. fsmdef.c 4481

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/