diff --git a/tests/auto/corelib/text/qstring/tst_qstring.cpp b/tests/auto/corelib/text/qstring/tst_qstring.cpp
index d15be52e413..f3d2594e348 100644
--- a/tests/auto/corelib/text/qstring/tst_qstring.cpp
+++ b/tests/auto/corelib/text/qstring/tst_qstring.cpp
@@ -432,6 +432,8 @@ private slots:
     void prepend_char_data()          { prepend_data({EmptyIsNoop, Latin1Encoded}); }
 #endif
 
+    void prependEventuallyProducesFreeSpaceAtBegin();
+
     void append_qstring()            { append_impl<QString>(); }
     void append_qstring_data()       { append_data(); }
     void append_qstringview()        { append_impl<QStringView,  QString &(QString::*)(QStringView)>(); }
@@ -3809,6 +3811,14 @@ void tst_QString::prepend_bytearray_special_cases()
 }
 #endif // !defined(QT_RESTRICTED_CAST_FROM_ASCII) && !defined(QT_NO_CAST_FROM_ASCII)
 
+void tst_QString::prependEventuallyProducesFreeSpaceAtBegin()
+{
+    QString s;
+    for (int i = 0; i < 100 && !s.data_ptr().freeSpaceAtBegin(); ++i)
+        s.prepend(u'd');
+    QCOMPARE_GT(s.data_ptr().freeSpaceAtBegin(), 1);
+}
+
 void tst_QString::replace_uint_uint()
 {
     QFETCH( QString, string );