diff --git a/include/wlr/interfaces/wlr_touch.h b/include/wlr/interfaces/wlr_touch.h
index cc426332..e4ea6a78 100644
--- a/include/wlr/interfaces/wlr_touch.h
+++ b/include/wlr/interfaces/wlr_touch.h
@@ -16,7 +16,7 @@ struct wlr_touch_impl {
 };
 
 void wlr_touch_init(struct wlr_touch *touch,
-		struct wlr_touch_impl *impl);
+		const struct wlr_touch_impl *impl);
 void wlr_touch_destroy(struct wlr_touch *touch);
 
 #endif
diff --git a/include/wlr/types/wlr_touch.h b/include/wlr/types/wlr_touch.h
index 99316ae0..80ba768e 100644
--- a/include/wlr/types/wlr_touch.h
+++ b/include/wlr/types/wlr_touch.h
@@ -15,7 +15,7 @@
 struct wlr_touch_impl;
 
 struct wlr_touch {
-	struct wlr_touch_impl *impl;
+	const struct wlr_touch_impl *impl;
 
 	struct {
 		struct wl_signal down;
diff --git a/types/wlr_touch.c b/types/wlr_touch.c
index ba7ffac7..f04a8ffe 100644
--- a/types/wlr_touch.c
+++ b/types/wlr_touch.c
@@ -5,7 +5,7 @@
 #include <wlr/types/wlr_touch.h>
 
 void wlr_touch_init(struct wlr_touch *touch,
-		struct wlr_touch_impl *impl) {
+		const struct wlr_touch_impl *impl) {
 	touch->impl = impl;
 	wl_signal_init(&touch->events.down);
 	wl_signal_init(&touch->events.up);