diff --git a/include/zenoh-pico/api/handlers.h b/include/zenoh-pico/api/handlers.h
index 752a6860e..f258f5846 100644
--- a/include/zenoh-pico/api/handlers.h
+++ b/include/zenoh-pico/api/handlers.h
@@ -117,8 +117,10 @@
 
 #define _Z_CHANNEL_DEFINE_DUMMY(item_name, kind_name)   \
     typedef struct {                                    \
+        uint8_t _foo;                                   \
     } z_owned_##kind_name##_handler_##item_name##_t;    \
     typedef struct {                                    \
+        uint8_t _foo;                                   \
     } z_loaned_##kind_name##_handler_##item_name##_t;   \
     void *z_##kind_name##_handler_##item_name##_loan(); \
     void *z_##kind_name##_handler_##item_name##_move(); \