diff --git a/src/controls/QskSpinBox.cpp b/src/controls/QskSpinBox.cpp
index 2e628b4c..f6a238c3 100644
--- a/src/controls/QskSpinBox.cpp
+++ b/src/controls/QskSpinBox.cpp
@@ -36,7 +36,7 @@ namespace
         return QskAspect::NoSubcontrol;
     }
 
-    inline QskAspect aspectDecoration()
+    inline constexpr QskAspect aspectDecoration()
     {
         return QskSpinBox::Panel | QskAspect::Style;
     }