diff --git a/autotests/addresstest.cpp b/autotests/addresstest.cpp
--- a/autotests/addresstest.cpp
+++ b/autotests/addresstest.cpp
@@ -32,7 +32,7 @@
 #ifndef Q_OS_WIN
 void initLocale()
 {
-    qputenv("LC_ALL", "en_US.utf-8");
+    qputenv("LC_ALL", "it_CH.utf-8");
 }
 
 Q_CONSTRUCTOR_FUNCTION(initLocale)
@@ -214,10 +214,24 @@
         address.setLocality(QStringLiteral("Lummerstadt"));
         address.setCountry(QString());
 
-        const QString result(QStringLiteral("Jim Knopf\nLummerlandstr. 1\nLummerstadt, 12345"));
+        const QString result(QStringLiteral("Jim Knopf\nLummerlandstr. 1\n12345 Lummerstadt"));
 
         QCOMPARE(address.formattedAddress(QStringLiteral("Jim Knopf")), result);
     }
+
+    {
+        KContacts::Address address;
+        address.setStreet(QStringLiteral("Haus Randa"));
+        address.setPostalCode(QStringLiteral("1234"));
+        address.setLocality(QStringLiteral("Randa"));
+        address.setPostOfficeBox(QStringLiteral("5678"));
+        address.setCountry(QStringLiteral("Schweiz"));
+
+        // we want the Italian variant of the Swiss format for it_CH
+        const QString result(QStringLiteral("Dr. Konqui\nCasella postale 5678\nHaus Randa\n1234 Randa\n\nSCHWEIZ"));
+
+        QCOMPARE(address.formattedAddress(QStringLiteral("Dr. Konqui")), result);
+    }
 }
 
 void AddressTest::shouldExportVcard3()
diff --git a/src/address.cpp b/src/address.cpp
--- a/src/address.cpp
+++ b/src/address.cpp
@@ -576,6 +576,16 @@
     return str;
 }
 
+static QString countryCodeFromLocale()
+{
+    const auto n = QLocale().name(); // this is in the form <lang>_<COUNTRY>, with the exception of 'C'
+    const auto idx = n.indexOf(QLatin1Char('_'));
+    if (idx > 0) {
+        return n.mid(idx + 1).toLower();
+    }
+    return {};
+}
+
 QString Address::formattedAddress(const QString &realName, const QString &orgaName) const
 {
     QString ciso;
@@ -587,7 +597,7 @@
         ciso = countryToISO(country());
     } else {
         // fall back to our own country
-        ciso = QLocale().bcp47Name();
+        ciso = countryCodeFromLocale();
     }
     KConfig entry(QStringLiteral(":/org.kde.kcontacts/addressformatrc"));
 
@@ -617,7 +627,7 @@
     // now add the country line if needed (formatting this time according to
     // the rules of our own system country )
     if (!country().isEmpty()) {
-        KConfigGroup group = entry.group(QLocale().name());
+        KConfigGroup group = entry.group(countryCodeFromLocale());
         QString cpos = group.readEntry("AddressCountryPosition");
         if (QLatin1String("BELOW") == cpos || cpos.isEmpty()) {
             ret = ret + QLatin1String("\n\n") + country().toUpper();