diff --git a/src/app/puzzle/vpcarrouselpiecelist.h b/src/app/puzzle/vpcarrouselpiecelist.h
index 8dd2ee55d..48d8cf5ce 100644
--- a/src/app/puzzle/vpcarrouselpiecelist.h
+++ b/src/app/puzzle/vpcarrouselpiecelist.h
@@ -38,7 +38,7 @@ class VPCarrouselPieceList : public QListWidget
 {
     Q_OBJECT
 public:
-    VPCarrouselPieceList(QWidget* parent);
+    explicit VPCarrouselPieceList(QWidget* parent);
     ~VPCarrouselPieceList();
 
     /**
diff --git a/src/app/puzzle/vpgraphicssheet.h b/src/app/puzzle/vpgraphicssheet.h
index 0c20ea2ec..4ee8b4329 100644
--- a/src/app/puzzle/vpgraphicssheet.h
+++ b/src/app/puzzle/vpgraphicssheet.h
@@ -41,7 +41,7 @@ public:
     ~VPGraphicsSheet();
 
     QRectF boundingRect() const override;
-    void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget) override;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
 
 
     QRectF GetSheetRect() const;
diff --git a/src/app/puzzle/vppiece.h b/src/app/puzzle/vppiece.h
index c49982aeb..4e88434ae 100644
--- a/src/app/puzzle/vppiece.h
+++ b/src/app/puzzle/vppiece.h
@@ -42,7 +42,7 @@ class VPPiece : public QObject, public VLayoutPiece
     Q_OBJECT
 public:
     VPPiece();
-    VPPiece(VLayoutPiece layoutPiece);
+    explicit VPPiece(VLayoutPiece layoutPiece);
 
     ~VPPiece();
 
diff --git a/src/libs/vwidgets/vgraphicssimpletextitem.cpp b/src/libs/vwidgets/vgraphicssimpletextitem.cpp
index 33659fd00..5101489d4 100644
--- a/src/libs/vwidgets/vgraphicssimpletextitem.cpp
+++ b/src/libs/vwidgets/vgraphicssimpletextitem.cpp
@@ -149,7 +149,7 @@ void VGraphicsSimpleTextItem::SetShowParentTooltip(bool show)
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-void VGraphicsSimpleTextItem::SetRealPos(QPointF pos)
+void VGraphicsSimpleTextItem::SetRealPos(const QPointF &pos)
 {
     m_realPos = pos;
 
diff --git a/src/libs/vwidgets/vgraphicssimpletextitem.h b/src/libs/vwidgets/vgraphicssimpletextitem.h
index a30e08fb3..b38a1018d 100644
--- a/src/libs/vwidgets/vgraphicssimpletextitem.h
+++ b/src/libs/vwidgets/vgraphicssimpletextitem.h
@@ -63,7 +63,7 @@ public:
 
     void SetShowParentTooltip(bool show);
 
-    void SetRealPos(QPointF pos);
+    void SetRealPos(const QPointF &pos);
 
     QColor BaseColor() const;
     void   SetBaseColor(const QColor &baseColor);