diff --git a/src/corelib/tools/qlocale.cpp b/src/corelib/tools/qlocale.cpp
index ab95f60115..63219b5bab 100644
--- a/src/corelib/tools/qlocale.cpp
+++ b/src/corelib/tools/qlocale.cpp
@@ -328,7 +328,7 @@ QByteArray QLocalePrivate::bcp47Name(char separator) const
     if (m_data->m_language_id == QLocale::AnyLanguage)
         return QByteArray();
     if (m_data->m_language_id == QLocale::C)
-        return QByteArrayLiteral("C");
+        return QByteArrayLiteral("en");
 
     QLocaleId localeId = QLocaleId::fromIds(m_data->m_language_id, m_data->m_script_id, m_data->m_country_id);
     return localeId.withLikelySubtagsRemoved().name(separator);
diff --git a/tests/auto/corelib/tools/qlocale/tst_qlocale.cpp b/tests/auto/corelib/tools/qlocale/tst_qlocale.cpp
index d08e5dc289..10d78b1f2f 100644
--- a/tests/auto/corelib/tools/qlocale/tst_qlocale.cpp
+++ b/tests/auto/corelib/tools/qlocale/tst_qlocale.cpp
@@ -2529,7 +2529,7 @@ void tst_QLocale::textDirection()
 
 void tst_QLocale::bcp47Name()
 {
-    QCOMPARE(QLocale("C").bcp47Name(), QStringLiteral("C"));
+    QCOMPARE(QLocale("C").bcp47Name(), QStringLiteral("en"));
     QCOMPARE(QLocale("en").bcp47Name(), QStringLiteral("en"));
     QCOMPARE(QLocale("en_US").bcp47Name(), QStringLiteral("en"));
     QCOMPARE(QLocale("en_GB").bcp47Name(), QStringLiteral("en-GB"));