diff --git a/main/ui/src/main/resources/i18n/strings_ja.properties b/main/ui/src/main/resources/i18n/strings_ja.properties
index 08b31ee3f..f3e267d8e 100644
--- a/main/ui/src/main/resources/i18n/strings_ja.properties
+++ b/main/ui/src/main/resources/i18n/strings_ja.properties
@@ -125,6 +125,7 @@ main.vaultDetail.throughput.mbps=%.1f MiB/s
 
 # Wrong File Alert
 wrongFileAlert.title=不明なファイル
+wrongFileAlert.btn=Ok
 
 # Vault Options
 vaultOptions.general=基本設定