diff --git a/portable_endian.h b/portable_endian.h
index da0d140..7c1877c 100644
--- a/portable_endian.h
+++ b/portable_endian.h
@@ -49,6 +49,24 @@
 
 #	include <sys/endian.h>
 
+#elif defined(__sun)
+
+#	include <sys/byteorder.h>
+#	define htobe16(x) BE_16(x)
+#	define htole16(x) LE_16(x)
+#	define be16toh(x) BE_IN16(x)
+#	define le16toh(x) LE_IN16(x)
+
+#	define htobe32(x) BE_32(x)
+#	define htole32(x) LE_32(x)
+#	define be32toh(x) BE_IN32(x)
+#	define le32toh(x) LE_IN32(x)
+
+#	define htobe64(x) BE_64(x)
+#	define htole64(x) LE_64(x)
+#	define be64toh(x) BE_IN64(x)
+#	define le64toh(x) LE_IN64(x)
+
 #elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
 
 #	include <sys/endian.h>