--- a/src/currency.h	Mon Mar 26 21:31:37 2007 +0000
+++ b/src/currency.h	Mon Mar 26 22:15:38 2007 +0000
@@ -40,7 +40,7 @@
 
 uint GetMaskOfAllowedCurrencies();
 void CheckSwitchToEuro();
-void ResetCurrencies();
+void ResetCurrencies(bool preserve_custom = true);
 StringID* BuildCurrencyDropdown();
 byte GetNewgrfCurrencyIdConverted(byte grfcurr_id);