VS 2013 regsvr32 buffer too small error when registering a COM dll

I have a atl/COM base solution I'm trying to convert to compile under VS 2013.  Whenever VS tries to register a dll I get this error (in part):

Microsoft Visual C++ Runtime Library

Program: C:\Windows\SysWow64\regsvr32.exe

File: f:\\dd\vctools\crt\crtw32\studio\vswprintf.c

Lin: 280

Expression: ("Buffer too small",0)

How do I get VS 2013 to successfully register a COM dll being build?

AliciaV