diff --git a/sw/airborne/downlink.h b/sw/airborne/downlink.h
index 0c838b12d7..7df5a5c1c8 100644
--- a/sw/airborne/downlink.h
+++ b/sw/airborne/downlink.h
@@ -32,6 +32,7 @@
 
 #include <inttypes.h>
 
+#include "modules.h"
 #include "messages.h"
 #include "airframe.h" // AC_ID is required