diff --git a/retroshare-gui/src/gui/common/MimeTextEdit.cpp b/retroshare-gui/src/gui/common/MimeTextEdit.cpp
index 60aff5cd5..5fc3a8cd1 100644
--- a/retroshare-gui/src/gui/common/MimeTextEdit.cpp
+++ b/retroshare-gui/src/gui/common/MimeTextEdit.cpp
@@ -361,7 +361,13 @@ QString MimeTextEdit::toHtml(const QByteArray &encoding) const
 	if (encoding.isEmpty()) {
 		html = QTextEdit::toHtml();
 	} else {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+		// Qt 6: toHtml() takes no arguments
+		html = doc->toHtml();
+#else
+		// Qt 5: toHtml() accepts encoding parameter
 		html = doc->toHtml(encoding);
+#endif
 	}
 	if (doc) {
 		doc->setDefaultStyleSheet(oldSheet);