diff --git a/src/gui/text/qtextdocument.cpp b/src/gui/text/qtextdocument.cpp
index 3203f85cc97..19c75b7b393 100644
--- a/src/gui/text/qtextdocument.cpp
+++ b/src/gui/text/qtextdocument.cpp
@@ -2142,6 +2142,7 @@ bool QTextHtmlExporter::emitCharFormatStyle(const QTextCharFormat &format)
         html += QLatin1String(" font-size:");
         html += QString::number(format.intProperty(QTextFormat::FontPixelSize));
         html += QLatin1String("px;");
+        attributesEmitted = true;
     }
 
     if (format.hasProperty(QTextFormat::FontWeight)
diff --git a/tests/auto/gui/text/qtextdocument/tst_qtextdocument.cpp b/tests/auto/gui/text/qtextdocument/tst_qtextdocument.cpp
index a24d17dc3df..c0f0f1c2439 100644
--- a/tests/auto/gui/text/qtextdocument/tst_qtextdocument.cpp
+++ b/tests/auto/gui/text/qtextdocument/tst_qtextdocument.cpp
@@ -180,6 +180,8 @@ private slots:
 
     void copiedFontSize();
 
+    void QTBUG25778_pixelSizeFromHtml();
+
     void htmlExportImportBlockCount();
 
 private:
@@ -2840,6 +2842,18 @@ void tst_QTextDocument::receiveCursorPositionChangedAfterContentsChange()
     QCOMPARE(rec.first, QString("contentsChanged"));
 }
 
+void tst_QTextDocument::QTBUG25778_pixelSizeFromHtml()
+{
+    QTextDocument document1;
+    QTextDocument document2;
+
+    document1.setHtml("<span style=\"font-size: 24px\">Foobar</span>");
+    document2.setHtml(document1.toHtml());
+
+    QTextCursor cursor(&document2);
+    QCOMPARE(cursor.charFormat().font().pixelSize(), 24);
+}
+
 void tst_QTextDocument::copiedFontSize()
 {
     QTextDocument documentInput;