diff --git a/src/corelib/tools/qbytearray.cpp b/src/corelib/tools/qbytearray.cpp
index 64674ddc00..8770100749 100644
--- a/src/corelib/tools/qbytearray.cpp
+++ b/src/corelib/tools/qbytearray.cpp
@@ -4135,10 +4135,9 @@ ushort QByteArray::toUShort(bool *ok, int base) const
 
 double QByteArray::toDouble(bool *ok) const
 {
-    QByteArray nulled = nulTerminated();
     bool nonNullOk = false;
     int processed = 0;
-    double d = qt_asciiToDouble(nulled.constData(), nulled.length(),
+    double d = qt_asciiToDouble(constData(), size(),
                                 nonNullOk, processed, WhitespacesAllowed);
     if (ok)
         *ok = nonNullOk;
diff --git a/tests/auto/corelib/tools/qbytearray/tst_qbytearray.cpp b/tests/auto/corelib/tools/qbytearray/tst_qbytearray.cpp
index 1ed41793dc..d9e03439b8 100644
--- a/tests/auto/corelib/tools/qbytearray/tst_qbytearray.cpp
+++ b/tests/auto/corelib/tools/qbytearray/tst_qbytearray.cpp
@@ -1361,6 +1361,9 @@ void tst_QByteArray::toDouble_data()
     QTest::newRow("trailing spaces") << QByteArray("1.2345 \n\r\t") << 1.2345 << true;
     QTest::newRow("leading junk") << QByteArray("x1.2345") << 0.0 << false;
     QTest::newRow("trailing junk") << QByteArray("1.2345x") << 0.0 << false;
+
+    QTest::newRow("raw, null plus junk") << QByteArray::fromRawData("1.2\0 junk", 9) << 0.0 << false;
+    QTest::newRow("raw, null-terminator not included") << QByteArray::fromRawData("2.3", 3) << 2.3 << true;
 }
 
 void tst_QByteArray::toDouble()