diff --git a/sw/tools/gen_modules.ml b/sw/tools/gen_modules.ml
index 11d6800b67..96652c87fb 100644
--- a/sw/tools/gen_modules.ml
+++ b/sw/tools/gen_modules.ml
@@ -229,7 +229,7 @@ let print_event_functions = fun modules ->
 
 let print_datalink_functions = fun modules ->
   lprintf out_h "\n#include \"messages.h\"\n";
-  lprintf out_h "static inline void modules_parse_datalink(uint8_t msg_id) {\n";
+  lprintf out_h "static inline void modules_parse_datalink(uint8_t msg_id __attribute__ ((unused))) {\n";
   right ();
   let else_ = ref "" in
   List.iter (fun m ->