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--- a/src/qtgui/main.cpp
+++ b/src/qtgui/main.cpp
@@ -188,7 +188,7 @@
     if (cfname && *cfname) {
 	string stylesheet;
 	file_to_string(cfname, stylesheet);
-	qApp->setStyleSheet(QString::fromAscii(stylesheet.c_str()));
+	qApp->setStyleSheet(QString::fromUtf8(stylesheet.c_str()));
     } else {
 	qApp->setStyleSheet(QString());
     }