diff --git a/GUI/Model/Mask/MasksSet.h b/GUI/Model/Mask/MasksSet.h
index fef22c9cdc11e41e42aab253146dcb8d72e8d30a..5dd0c66c71b1204d00d20034ce1d4c24cf7bd590 100644
--- a/GUI/Model/Mask/MasksSet.h
+++ b/GUI/Model/Mask/MasksSet.h
@@ -29,20 +29,20 @@ class RegionOfInterestItem;
 class MasksSet {
 public:
     MasksSet();
-    ~MasksSet();
+    virtual ~MasksSet();
 
     QVector<MaskItem*> modifiableMaskItems() const;
     QVector<const MaskItem*> maskItems() const;
 
     //! Insert mask at given row.
-    virtual void insertMask(int row, MaskItem* maskItem);
+    void insertMask(int row, MaskItem* maskItem);
 
-    virtual void addMaskItem(MaskItem* maskItem);
+    void addMaskItem(MaskItem* maskItem);
 
     //! Move mask to a given row
-    virtual void moveMask(int from_row, int to_row);
+    void moveMask(int from_row, int to_row);
 
-    virtual void removeMaskAt(int row);
+    void removeMaskAt(int row);
 
     //! Can be nullptr.
     RegionOfInterestItem* regionOfInterestItem() const;