diff --git a/ui/drivers/qt/ui_qt_themes.h b/ui/drivers/qt/ui_qt_themes.h
index a141fcc3e2..d43867def2 100644
--- a/ui/drivers/qt/ui_qt_themes.h
+++ b/ui/drivers/qt/ui_qt_themes.h
@@ -216,6 +216,7 @@ static const QString qt_theme_dark_stylesheet = QStringLiteral(""
    "   min-height:20px;\n"
    "   min-width:80px;\n"
    "   padding:1px 3px 1px 3px;\n"
+   "   outline:none;\n"
    "}\n"
    "QPushButton::focus, QToolButton::focus {\n"
    "   background:qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 rgba(255,255,255,50), stop: 1 rgba(100,100,100,25));\n"