diff --git a/openbsc/src/rtp_proxy.c b/openbsc/src/rtp_proxy.c
index 924173d..a1f440d 100644
--- a/openbsc/src/rtp_proxy.c
+++ b/openbsc/src/rtp_proxy.c
@@ -19,7 +19,6 @@
  *
  */
 
-#include <endian.h>
 #include <errno.h>
 #include <unistd.h>
 #include <sys/socket.h>
@@ -37,6 +36,15 @@
 #include <openbsc/debug.h>
 #include <openbsc/rtp_proxy.h>
 
+/* attempt to determine byte order */
+#include <sys/types.h>
+#include <sys/param.h>
+#include <limits.h>
+
+#ifndef __BYTE_ORDER
+#error "__BYTE_ORDER should be defined by someone"
+#endif
+
 static LLIST_HEAD(rtp_sockets);
 
 /* should we mangle the CNAME inside SDES of RTCP packets? We disable