diff --git a/src/tables.c b/src/tables.c
index 182ab6379..63f35a71e 100644
--- a/src/tables.c
+++ b/src/tables.c
@@ -36,6 +36,11 @@
 #include "flexdef.h"
 #include "tables.h"
 
+#ifdef _MSC_VER
+#define htonl(n) _byteswap_ulong(n)
+#define htons(n) _byteswap_ushort(n)
+#endif
+
 /** Convert size_t to t_flag.
  *  @param n in {1,2,4}
  *  @return YYTD_DATA*.