diff --git a/include/wlr/types/wlr_idle_inhibit_v1.h b/include/wlr/types/wlr_idle_inhibit_v1.h
index a777ff43..8c20d2c8 100644
--- a/include/wlr/types/wlr_idle_inhibit_v1.h
+++ b/include/wlr/types/wlr_idle_inhibit_v1.h
@@ -25,6 +25,8 @@ struct wlr_idle_inhibit_manager_v1 {
 	struct {
 		struct wl_signal new_inhibitor;
 	} events;
+
+	void *data;
 };
 
 struct wlr_idle_inhibitor_v1 {
@@ -37,6 +39,8 @@ struct wlr_idle_inhibitor_v1 {
 	struct {
 		struct wl_signal destroy;
 	} events;
+
+	void *data;
 };
 
 struct wlr_idle_inhibit_manager_v1 *wlr_idle_inhibit_v1_create(struct wl_display *display);