1 files changed, 1 insertions, 1 deletions
diff --git a/src/currency.h b/src/currency.h
index a72eab7d0..86b46e713 100644
--- a/src/currency.h
+++ b/src/currency.h
@@ -40,7 +40,7 @@ extern CurrencySpec _currency_specs[NUM_CURRENCY];
 
 uint GetMaskOfAllowedCurrencies();
 void CheckSwitchToEuro();
-void ResetCurrencies();
+void ResetCurrencies(bool preserve_custom = true);
 StringID* BuildCurrencyDropdown();
 byte GetNewgrfCurrencyIdConverted(byte grfcurr_id);