diff --git a/include/wlr/types/wlr_cursor.h b/include/wlr/types/wlr_cursor.h
index 0883f3ca..b764e6d2 100644
--- a/include/wlr/types/wlr_cursor.h
+++ b/include/wlr/types/wlr_cursor.h
@@ -54,6 +54,8 @@ struct wlr_cursor {
 		struct wl_signal tablet_tool_tip;
 		struct wl_signal tablet_tool_button;
 	} events;
+
+	void *data;
 };
 
 struct wlr_cursor *wlr_cursor_create();