diff --git a/include/wlr/types/wlr_damage_ring.h b/include/wlr/types/wlr_damage_ring.h
index 67fedddc..d503a502 100644
--- a/include/wlr/types/wlr_damage_ring.h
+++ b/include/wlr/types/wlr_damage_ring.h
@@ -52,7 +52,7 @@ void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
  * Returns true if the region intersects the ring bounds, false otherwise.
  */
 bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
-	pixman_region32_t *damage);
+	const pixman_region32_t *damage);
 
 /**
  * Add a box to the current damage.
diff --git a/types/wlr_damage_ring.c b/types/wlr_damage_ring.c
index 000aba93..4623b915 100644
--- a/types/wlr_damage_ring.c
+++ b/types/wlr_damage_ring.c
@@ -39,7 +39,7 @@ void wlr_damage_ring_set_bounds(struct wlr_damage_ring *ring,
 }
 
 bool wlr_damage_ring_add(struct wlr_damage_ring *ring,
-		pixman_region32_t *damage) {
+		const pixman_region32_t *damage) {
 	pixman_region32_t clipped;
 	pixman_region32_init(&clipped);
 	pixman_region32_intersect_rect(&clipped, damage,