diff --git a/app/locales/locales.ts b/app/locales/locales.ts
index 4994bba9e..00ab7d0c8 100644
--- a/app/locales/locales.ts
+++ b/app/locales/locales.ts
@@ -6,6 +6,7 @@ import {
   FormatLocaleDefinition,
   FormatLocaleObject,
 } from "d3-format";
+import numberFormatCh from "d3-format/locale/de-CH.json";
 import {
   timeFormatLocale,
   TimeLocaleDefinition,
@@ -54,7 +55,7 @@ i18n.activate(defaultLocale);
 
 /**
  * Parses a valid app locale from a locale string (e.g. a Accept-Language header).
- * If unparseable, returns default locale.
+ * If unparsable, returns default locale.
  * @param localeString locale string, e.g. de,en-US;q=0.7,en;q=0.3
  */
 export const parseLocaleString = (
@@ -78,7 +79,7 @@ export const getD3TimeFormatLocale = (locale: string): TimeLocaleObject =>
   d3TimeFormatLocales[locale] ?? d3TimeFormatLocales.de;
 
 const d3FormatLocales: { [locale: string]: FormatLocaleObject } = {
-  de: formatLocale(timeFormatDe as FormatLocaleDefinition),
+  de: formatLocale(numberFormatCh as FormatLocaleDefinition),
   // fr: formatLocale(timeFormatDe as FormatLocaleDefinition),
   // it: formatLocale(timeFormatDe as FormatLocaleDefinition),
   // en: formatLocale(timeFormatDe as FormatLocaleDefinition),