1diff --git a/kstyle/breezehelper.h b/kstyle/breezehelper.h
2index 3b6320dc..ab42981c 100644
3--- a/kstyle/breezehelper.h
4+++ b/kstyle/breezehelper.h
5@@ -314,11 +314,11 @@ namespace Breeze
6         //@}
7
8         //* frame radius
9-        constexpr qreal frameRadius( const int penWidth = PenWidth::NoPen, const qreal bias = 0 ) const
10+        qreal frameRadius( const int penWidth = PenWidth::NoPen, const qreal bias = 0 ) const
11         { return qMax( Metrics::Frame_FrameRadius - (0.5 * penWidth) + bias, 0.0 ); }
12
13         //* frame radius with new pen width
14-        constexpr qreal frameRadiusForNewPenWidth( const qreal oldRadius, const int penWidth ) const
15+        qreal frameRadiusForNewPenWidth( const qreal oldRadius, const int penWidth ) const
16         { return qMax( oldRadius - (0.5 * penWidth), 0.0 ); }
17
18         //* return a QRectF with the appropriate size for a rectangle with a pen stroke
19