diff --git a/geometry/vdetail.cpp b/geometry/vdetail.cpp
index 6bfdf3add..105c90cba 100644
--- a/geometry/vdetail.cpp
+++ b/geometry/vdetail.cpp
@@ -70,7 +70,7 @@ bool VDetail::Containes(const qint64 &id) const
     return false;
 }
 
-VNodeDetail &VDetail::operator [](int indx)
+VNodeDetail &VDetail::operator [](ptrdiff_t indx)
 {
     return nodes[indx];
 }
diff --git a/geometry/vdetail.h b/geometry/vdetail.h
index c715ea8da..c85b411a0 100644
--- a/geometry/vdetail.h
+++ b/geometry/vdetail.h
@@ -46,7 +46,7 @@ public:
     void           Clear();
     inline qint32  CountNode() const {return nodes.size();}
     bool           Containes(const qint64 &id)const;
-    VNodeDetail &  operator[](int indx);
+    VNodeDetail &  operator[](ptrdiff_t indx);
     inline QString getName() const {return name;}
     inline void    setName(const QString &value) {name = value;}
     inline qreal   getMx() const {return mx;}
diff --git a/geometry/vsplinepath.cpp b/geometry/vsplinepath.cpp
index 23c5d45b0..01eb67bc4 100644
--- a/geometry/vsplinepath.cpp
+++ b/geometry/vsplinepath.cpp
@@ -146,7 +146,7 @@ VSplinePath &VSplinePath::operator =(const VSplinePath &path)
     return *this;
 }
 
-VSplinePoint & VSplinePath::operator[](int indx)
+VSplinePoint & VSplinePath::operator[](ptrdiff_t indx)
 {
     return path[indx];
 }
diff --git a/geometry/vsplinepath.h b/geometry/vsplinepath.h
index 94279c109..77d7c956d 100644
--- a/geometry/vsplinepath.h
+++ b/geometry/vsplinepath.h
@@ -74,7 +74,7 @@ public:
     inline void   setKCurve(const qreal &value) {kCurve = value;}
     inline const  QVector<VSplinePoint> *GetPoint() const {return &path;}
     VSplinePath   &operator=(const VSplinePath &path);
-    VSplinePoint  &operator[](int indx);
+    VSplinePoint  &operator[](ptrdiff_t indx);
     inline Draw::Draws getMode() const {return mode;}
     inline void   setMode(const Draw::Draws &value) {mode = value;}