diff --git a/locales/en-US.yml b/locales/en-US.yml
index c7edbcce69..99bc815b21 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -968,6 +968,7 @@ admin/views/instance.vue:
   instance-description: "Instance description"
   host: "Host"
   banner-url: "Banner image URL"
+  error-image-url: "エラー画像URL"
   languages: "Language of this instance"
   languages-desc: "You can add more than one, separated by spaces."
   maintainer-config: "Administrator information"