diff --git a/src/rx/rx_packet.c b/src/rx/rx_packet.c
index 045ece15c7..12822bfa84 100644
--- a/src/rx/rx_packet.c
+++ b/src/rx/rx_packet.c
@@ -83,6 +83,7 @@ RCSID
 #include "rx_packet.h"
 #include "rx_globals.h"
 #include <lwp.h>
+#include <assert.h>
 #ifdef HAVE_STRING_H
 #include <string.h>
 #else