diff --git a/config/default/currency.currency.AFN.yml b/config/default/currency.currency.AFN.yml
index bea6f25..c9648da 100644
--- a/config/default/currency.currency.AFN.yml
+++ b/config/default/currency.currency.AFN.yml
@@ -4,5 +4,6 @@ currencyNumber: '971'
 sign: ؋
 subunits: 100
 label: 'Afghan afghani'
+exchangeRates: { }
 usages:
     - { start: '2002-10-07', end: '', countryCode: AF }
diff --git a/config/default/currency.currency.EUR.yml b/config/default/currency.currency.EUR.yml
index 838e298..3002daf 100644
--- a/config/default/currency.currency.EUR.yml
+++ b/config/default/currency.currency.EUR.yml
@@ -4,6 +4,7 @@ currencyNumber: '978'
 sign: €
 subunits: 100
 label: euro
+exchangeRates: { }
 usages:
     - { start: '1999-01-01', end: '', countryCode: AD }
     - { start: '1999-01-01', end: '', countryCode: AT }
diff --git a/config/default/currency.currency.UAH.yml b/config/default/currency.currency.UAH.yml
index f42a1cf..632f947 100644
--- a/config/default/currency.currency.UAH.yml
+++ b/config/default/currency.currency.UAH.yml
@@ -4,5 +4,6 @@ currencyNumber: '980'
 sign: ₴
 subunits: 100
 label: 'Ukrainian hryvnia'
+exchangeRates: { }
 usages:
     - { start: '1996-09-02', end: '', countryCode: UA }
diff --git a/config/default/currency.currency.USD.yml b/config/default/currency.currency.USD.yml
index d401cc9..917d469 100644
--- a/config/default/currency.currency.USD.yml
+++ b/config/default/currency.currency.USD.yml
@@ -4,6 +4,7 @@ currencyNumber: '840'
 sign: $
 subunits: 100
 label: 'U.S. dollar'
+exchangeRates: { }
 usages:
     - { start: '1904-07-16', end: '', countryCode: AS }
     - { start: '1899-01-01', end: '1959-01-01', countryCode: CU }
diff --git a/config/install/currency.currency.XXX.yml b/config/install/currency.currency.XXX.yml
index 00b7169..2c1a5ee 100644
--- a/config/install/currency.currency.XXX.yml
+++ b/config/install/currency.currency.XXX.yml
@@ -5,6 +5,7 @@ currencyNumber: '999'
 sign: ¤
 subunits: 0
 label: 'No currency'
+exchangeRates: { }
 usages:
     - { start: '', end: '', countryCode: AQ }
     - { start: '', end: '', countryCode: ZZ }