diff --git a/src/frontends/qt4/GuiDocument.cpp b/src/frontends/qt4/GuiDocument.cpp
index ba55eb2fda..164fe9341e 100644
--- a/src/frontends/qt4/GuiDocument.cpp
+++ b/src/frontends/qt4/GuiDocument.cpp
@@ -1761,7 +1761,16 @@ void GuiDocument::osFontsChanged(bool nontexfonts)
 {
 	bool const tex_fonts = !nontexfonts;
 	updateFontlist();
+	// store default format
+	QString const dformat = outputModule->defaultFormatCO->itemData(
+		outputModule->defaultFormatCO->currentIndex()).toString();
 	updateDefaultFormat();
+	// try to restore default format
+	int index = outputModule->defaultFormatCO->findData(dformat);
+	// set to default if format is not found
+	if (index == -1)
+		index = 0;
+	outputModule->defaultFormatCO->setCurrentIndex(index);
 	langModule->encodingCO->setEnabled(tex_fonts &&
 		!langModule->defaultencodingRB->isChecked());
 	langModule->defaultencodingRB->setEnabled(tex_fonts);