1 files changed, 9 insertions, 5 deletions
diff --git a/src/gui/inc/gui.h b/src/gui/inc/gui.h
index 7198af0..18ed37b 100644
--- a/src/gui/inc/gui.h
+++ b/src/gui/inc/gui.h
@@ -12,11 +12,15 @@ extern "C"
 
 struct gui_common
 {
-    void (*add_child)(struct gui_common *parent, struct gui_common *child);
-    int (*update)(struct gui_common *, const union peripheral *,
-        const struct camera *);
-    int (*render)(const struct gui_common *);
-    void (*get_dim)(const struct gui_common *, short *w, short *h);
+    const struct gui_common_cb
+    {
+        void (*add_child)(struct gui_common *parent, struct gui_common *child);
+        int (*update)(struct gui_common *, const union peripheral *,
+            const struct camera *);
+        int (*render)(const struct gui_common *);
+        void (*get_dim)(const struct gui_common *, short *w, short *h);
+    } *cb;
+
     short x, y;
     bool hcentered, vcentered;
     struct gui_common *parent, *child, *sibling;