diff --git a/types/flexmonster/index.d.ts b/types/flexmonster/index.d.ts
index a215a5ba3b..192e8f2d93 100644
--- a/types/flexmonster/index.d.ts
+++ b/types/flexmonster/index.d.ts
@@ -180,6 +180,7 @@ declare namespace Flexmonster {
         dataSourceInfo?: string;
         dataSourceType?: string;
         fieldSeparator?: string;
+        thousandSeparator?: string;
         filename?: string;
         ignoreQuotedLineBreaks?: boolean;
         proxyUrl?: string;