diff --git a/src/libCom/osi/os/WIN32/osdStrtod.h b/src/libCom/osi/os/WIN32/osdStrtod.h
index d245df7dc..4edb444ee 100644
--- a/src/libCom/osi/os/WIN32/osdStrtod.h
+++ b/src/libCom/osi/os/WIN32/osdStrtod.h
@@ -23,7 +23,7 @@ epicsShareFunc double epicsStrtod(const char *str, char **endp);
  * Older compilers have these equivalents though
  */
 
-#ifndef _MINGW
+#if !defined(_MINGW) && (_MSC_VER < 1800)
 #  define strtoll _strtoi64
 #  define strtoull _strtoui64
 #endif