diff --git a/src/corelib/serialization/qxmlstream.cpp b/src/corelib/serialization/qxmlstream.cpp
index c6d085714fb..eebccc6cc5d 100644
--- a/src/corelib/serialization/qxmlstream.cpp
+++ b/src/corelib/serialization/qxmlstream.cpp
@@ -827,6 +827,7 @@ void QXmlStreamReaderPrivate::init()
     isWhitespace = true;
     isCDATA = false;
     standalone = false;
+    hasStandalone = false;
     tos = 0;
     resumeReduction = 0;
     state_stack[tos++] = 0;
@@ -1777,7 +1778,6 @@ void QXmlStreamReaderPrivate::startDocument()
      * proper order:
      *
      * [23]     XMLDecl     ::=     '<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>' */
-    bool hasStandalone = false;
 
     for (qsizetype i = 0; err.isNull() && i < n; ++i) {
         Attribute &attrib = attributeStack[i];
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index b1fee62e04d..ffa49f8c642 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -383,6 +383,7 @@ public:
     uint hasExternalDtdSubset : 1;
     uint lockEncoding : 1;
     uint namespaceProcessing : 1;
+    uint hasStandalone : 1; // TODO: expose in public API
 
     int resumeReduction;
     void resume(int rule);
@@ -509,6 +510,8 @@ public:
 
     QXmlStreamEntityResolver *entityResolver;
 
+    static QXmlStreamReaderPrivate *get(QXmlStreamReader *q) { return q->d_func(); }
+
 private:
     /*! \internal
        Never assign to variable type directly. Instead use this function.
diff --git a/src/xml/dom/qdomhelpers.cpp b/src/xml/dom/qdomhelpers.cpp
index 62258fbdfd3..48869907f8f 100644
--- a/src/xml/dom/qdomhelpers.cpp
+++ b/src/xml/dom/qdomhelpers.cpp
@@ -8,6 +8,7 @@
 #include "qdomhelpers_p.h"
 #include "qdom_p.h"
 #include "qxmlstream.h"
+#include "private/qxmlstream_p.h"
 
 #include <memory>
 #include <stack>
@@ -264,9 +265,10 @@ bool QDomParser::parseProlog()
                 if (reader->isStandaloneDocument()) {
                     value += u" standalone='yes'"_s;
                 } else {
-                    // TODO: Add standalone='no', if 'standalone' is specified. With the current
-                    // QXmlStreamReader there is no way to figure out if it was specified or not.
-                    // QXmlStreamReader needs to be modified for handling that case correctly.
+                    // Add the standalone attribute only if it was specified
+                    QXmlStreamReaderPrivate *priv = QXmlStreamReaderPrivate::get(reader);
+                    if (priv->hasStandalone)
+                        value += u" standalone='no'"_s;
                 }
 
                 if (!domBuilder.processingInstruction(u"xml"_s, value)) {
diff --git a/tests/auto/xml/dom/qdom/tst_qdom.cpp b/tests/auto/xml/dom/qdom/tst_qdom.cpp
index cfc869949f4..4cf48a9f4b0 100644
--- a/tests/auto/xml/dom/qdom/tst_qdom.cpp
+++ b/tests/auto/xml/dom/qdom/tst_qdom.cpp
@@ -105,6 +105,7 @@ private slots:
     void DTDInternalSubset() const;
     void DTDInternalSubset_data() const;
     void QTBUG49113_dontCrashWithNegativeIndex() const;
+    void standalone();
 
     void cleanupTestCase() const;
 
@@ -2225,6 +2226,31 @@ void tst_QDom::QTBUG49113_dontCrashWithNegativeIndex() const
     QVERIFY(node.isNull());
 }
 
+void tst_QDom::standalone()
+{
+    {
+        QDomDocument doc;
+        const QString dtd("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"
+                    "<Test/>\n");
+        doc.setContent(dtd);
+        QVERIFY(doc.toString().contains("standalone=\'no\'"));
+    }
+    {
+        QDomDocument doc;
+        const QString dtd("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
+                    "<Test/>\n");
+        doc.setContent(dtd);
+        QVERIFY(!doc.toString().contains("standalone"));
+    }
+    {
+        QDomDocument doc;
+        const QString dtd("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
+                    "<Test/>\n");
+        doc.setContent(dtd);
+        QVERIFY(doc.toString().contains("standalone=\'yes\'"));
+    }
+}
+
 void tst_QDom::DTDInternalSubset() const
 {
     QFETCH( QString, doc );