diff --git a/evutil.c b/evutil.c
index 1627809d..b9521ec6 100644
--- a/evutil.c
+++ b/evutil.c
@@ -1562,7 +1562,7 @@ evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
 	int r;
 	if (!buflen)
 		return 0;
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || defined(WIN32)
 	r = _vsnprintf(buf, buflen, format, ap);
 	if (r < 0)
 		r = _vscprintf(format, ap);