diff --git a/3rdParty/hoedown/buffer.c b/3rdParty/hoedown/buffer.c
index a28c5e4..b7897d7 100644
--- a/3rdParty/hoedown/buffer.c
+++ b/3rdParty/hoedown/buffer.c
@@ -5,6 +5,12 @@
 #include <string.h>
 #include <assert.h>
 
+
+#ifndef _WIN32
+#define vsnprintf_s(buf,s1,s2,...)	vsnprintf(buf,s1,__VA_ARGS__)
+#endif
+
+
 void *
 hoedown_malloc(size_t size)
 {