diff --git a/src/currency.h b/src/currency.h
--- a/src/currency.h
+++ b/src/currency.h
@@ -73,6 +73,7 @@ enum Currencies {
 /** Specification of a currency. */
 struct CurrencySpec {
 	uint16_t rate;           ///< The conversion rate compared to the base currency.
+	std::string separator; ///< The thousands separator for this currency.
 	TimerGameCalendar::Year to_euro; ///< Year of switching to the Euro. May also be #CF_NOEURO or #CF_ISEURO.
 	std::string prefix;    ///< Prefix to apply when formatting money in this currency.
 	std::string suffix;    ///< Suffix to apply when formatting money in this currency.
@@ -91,8 +92,8 @@ struct CurrencySpec {
 
 	CurrencySpec() = default;
 
-	CurrencySpec(uint16_t rate, TimerGameCalendar::Year to_euro, const char *prefix, const char *suffix, const char *code, byte symbol_pos, StringID name) :
-		rate(rate), to_euro(to_euro), prefix(prefix), suffix(suffix), code(code), symbol_pos(symbol_pos), name(name)
+	CurrencySpec(uint16_t rate, const char *separator, TimerGameCalendar::Year to_euro, const char *prefix, const char *suffix, const char *code, byte symbol_pos, StringID name) :
+		rate(rate), separator(separator), to_euro(to_euro), prefix(prefix), suffix(suffix), code(code), symbol_pos(symbol_pos), name(name)
 	{
 	}
 };