diff --git a/pri_q921.h b/pri_q921.h
index d0f63ca..3ef5566 100755
--- a/pri_q921.h
+++ b/pri_q921.h
@@ -30,6 +30,9 @@
 #include <endian.h>
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>
+#define __BYTE_ORDER _BYTE_ORDER
+#define __BIG_ENDIAN _BIG_ENDIAN
+#define __LITTLE_ENDIAN _LITTLE_ENDIAN
 #endif
 
 /* Timer values */