diff --git a/package/utils/otrx/src/otrx.c b/package/utils/otrx/src/otrx.c
index 11db426a1d..131d8d6052 100644
--- a/package/utils/otrx/src/otrx.c
+++ b/package/utils/otrx/src/otrx.c
@@ -10,6 +10,7 @@
  */
 
 #include <byteswap.h>
+#include <endian.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>