diff --git a/qt/qtbase/src/gui/text/qtextdocument.cpp b/qt/qtbase/src/gui/text/qtextdocument.cpp
index f8215f92e..bed866522 100644
--- a/qt/qtbase/src/gui/text/qtextdocument.cpp
+++ b/qt/qtbase/src/gui/text/qtextdocument.cpp
@@ -2417,6 +2417,19 @@ bool QTextHtmlExporter::emitCharFormatStyle(const QTextCharFormat &format)
         html += QLatin1Char(';');
         attributesEmitted = true;
     }
+    
+    if (format.hasProperty(QTextFormat::FontLetterSpacing) && format.fontLetterSpacing() != defaultCharFormat.fontLetterSpacing()) {
+        html += QLatin1String(" letter-spacing:");
+        qreal value = format.fontLetterSpacing();
+        const bool percentSpacing = (format.fontLetterSpacingType() == QFont::PercentageSpacing);
+        // Map to em (100% == 0em). 0% is treated as 100% (== 0em) by Qt and doesn't need conversion.
+        if (percentSpacing && value != 0) {
+            value = (value / 100) - 1;
+        }
+        html += QString::number(value);
+        html += percentSpacing ? QLatin1String("em;") : QLatin1String("px;");
+        attributesEmitted = true;
+    }
 
     QLatin1String decorationTag(" text-decoration:");
     html += decorationTag;