diff --git a/GUI/Models/SphericalDetectorItem.h b/GUI/Models/SphericalDetectorItem.h
index c281ac79bc101ed7b17005b446e79f567ff1e271..9cf15a266dc96244f1d73481ddb55ba179bd49da 100644
--- a/GUI/Models/SphericalDetectorItem.h
+++ b/GUI/Models/SphericalDetectorItem.h
@@ -20,8 +20,10 @@
 class BasicAxisItem;
 
 class BA_CORE_API_ SphericalDetectorItem : public DetectorItem {
-public:
+private:
     static const QString P_PHI_AXIS;
+
+public:
     static const QString P_ALPHA_AXIS;
     SphericalDetectorItem();