diff --git a/src/wayland-util.c b/src/wayland-util.c
index c89a67bd..68116bf9 100644
--- a/src/wayland-util.c
+++ b/src/wayland-util.c
@@ -241,8 +241,10 @@ wl_map_insert_at(struct wl_map *map, uint32_t flags, uint32_t i, void *data)
 	if (count < i)
 		return -1;
 
-	if (count == i)
-		wl_array_add(entries, sizeof *start);
+	if (count == i) {
+		if (!wl_array_add(entries, sizeof *start))
+			return -1;
+	}
 
 	start = entries->data;
 	start[i].data = data;
@@ -277,7 +279,9 @@ wl_map_reserve_new(struct wl_map *map, uint32_t i)
 		return -1;
 
 	if (count == i) {
-		wl_array_add(entries, sizeof *start);
+		if (!wl_array_add(entries, sizeof *start))
+			return -1;
+
 		start = entries->data;
 		start[i].data = NULL;
 	} else {