--- a/artnet/private.h
+++ b/artnet/private.h
@@ -100,7 +100,9 @@ extern uint16_t HIGH_BYTE;
 #endif
 
 // byte ordering macros
+#ifndef bswap_16
 #define bswap_16(x)  ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+#endif
 
 // htols : convert short from host to little endian order
 #ifdef WIN32