diff --git a/src/Gui/QSint/actionpanel/actionpanelscheme.cpp b/src/Gui/QSint/actionpanel/actionpanelscheme.cpp
index d250f9a0b5..e8ecfe6e34 100644
--- a/src/Gui/QSint/actionpanel/actionpanelscheme.cpp
+++ b/src/Gui/QSint/actionpanel/actionpanelscheme.cpp
@@ -12,7 +12,7 @@ namespace QSint
 {
 
 
-constexpr QString ActionPanelScheme::minimumStyle = QStringLiteral(
+const QString ActionPanelScheme::minimumStyle = QStringLiteral(
     "QSint--ActionGroup QFrame[class='header'] {"
         "border: none;"
     "}"