diff --git a/include/wlr/types/wlr_ext_image_capture_source_v1.h b/include/wlr/types/wlr_ext_image_capture_source_v1.h
index 21c74cdec..0a93c49f6 100644
--- a/include/wlr/types/wlr_ext_image_capture_source_v1.h
+++ b/include/wlr/types/wlr_ext_image_capture_source_v1.h
@@ -43,6 +43,8 @@ struct wlr_ext_image_capture_source_v1 {
 		struct wl_signal frame; // struct wlr_ext_image_capture_source_v1_frame_event
 		struct wl_signal destroy;
 	} events;
+
+	void *data;
 };
 
 /**