diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 53e1b4c257..6fc72631dd 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -1555,7 +1555,7 @@ mdb_strerror(int err)
 	buf[0] = 0;
 	FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
 		FORMAT_MESSAGE_IGNORE_INSERTS,
-		NULL, err, 0, ptr, MSGSIZE, (va_list *)buf+MSGSIZE);
+		NULL, err, 0, ptr, MSGSIZE, NULL);
 	return ptr;
 #else
 	if (err < 0)