diff --git a/lib/src/portable/endian.h b/lib/src/portable/endian.h
index 4b3bdb83b..70df2c874 100644
--- a/lib/src/portable/endian.h
+++ b/lib/src/portable/endian.h
@@ -41,6 +41,25 @@
 
 # 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_16(x)
+#    define le16toh(x) LE_16(x)
+
+#    define htobe32(x) BE_32(x)
+#    define htole32(x) LE_32(x)
+#    define be32toh(x) BE_32(x)
+#    define le32toh(x) LE_32(x)
+
+#    define htobe64(x) BE_64(x)
+#    define htole64(x) LE_64(x)
+#    define be64toh(x) BE_64(x)
+#    define le64toh(x) LE_64(x)
+
 #elif defined(__APPLE__)
 #    define __BYTE_ORDER    BYTE_ORDER
 #    define __BIG_ENDIAN    BIG_ENDIAN