diff --git a/pico/lib/picopltf.h b/pico/lib/picopltf.h
index 9b7cffd..f0f129b 100644
--- a/pico/lib/picopltf.h
+++ b/pico/lib/picopltf.h
@@ -70,6 +70,10 @@
 #define __BYTE_ORDER _BYTE_ORDER
 #define __BIG_ENDIAN _BIG_ENDIAN
 #include <sys/endian.h>
+#elif (PICO_PLATFORM == PICO_MacOSX)
+#define __BYTE_ORDER BYTE_ORDER
+#define __BIG_ENDIAN BIG_ENDIAN
+#include <machine/endian.h>
 #else
 #include <endian.h>
 #endif