diff --git a/src/Mod/Part/App/BSplineCurvePyImp.cpp b/src/Mod/Part/App/BSplineCurvePyImp.cpp
index 2430fab220..64edcf022d 100644
--- a/src/Mod/Part/App/BSplineCurvePyImp.cpp
+++ b/src/Mod/Part/App/BSplineCurvePyImp.cpp
@@ -101,7 +101,7 @@ PyObject*  BSplineCurvePy::__reduce__(PyObject *args) const
     tuple.setItem(0, type);
 
     // create an argument tuple to create a copy
-    Py::Object self(this);
+    Py::Object self(const_cast<BSplineCurvePy*>(this));
     Py::Tuple data(7);
     data.setItem(0, Py::Callable(self.getAttr("getPoles")).apply());
     data.setItem(1, Py::Callable(self.getAttr("getMultiplicities")).apply());
diff --git a/src/Mod/Part/App/Geom2d/Geometry2dPyImp.cpp b/src/Mod/Part/App/Geom2d/Geometry2dPyImp.cpp
index 865bf4b667..3f5c634365 100644
--- a/src/Mod/Part/App/Geom2d/Geometry2dPyImp.cpp
+++ b/src/Mod/Part/App/Geom2d/Geometry2dPyImp.cpp
@@ -161,7 +161,7 @@ PyObject* Geometry2dPy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<Geometry2dPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create copy of geometry");
         return nullptr;
diff --git a/src/Mod/Part/App/GeometryExtensionPyImp.cpp b/src/Mod/Part/App/GeometryExtensionPyImp.cpp
index 68d0943e0f..872393dc29 100644
--- a/src/Mod/Part/App/GeometryExtensionPyImp.cpp
+++ b/src/Mod/Part/App/GeometryExtensionPyImp.cpp
@@ -59,7 +59,7 @@ PyObject* GeometryExtensionPy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<GeometryExtensionPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create copy of the geometry extension");
         return nullptr;
diff --git a/src/Mod/Part/App/GeometryPyImp.cpp b/src/Mod/Part/App/GeometryPyImp.cpp
index 7fa96ba216..6772437caf 100644
--- a/src/Mod/Part/App/GeometryPyImp.cpp
+++ b/src/Mod/Part/App/GeometryPyImp.cpp
@@ -159,7 +159,7 @@ PyObject* GeometryPy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<GeometryPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create copy of geometry");
         return nullptr;
@@ -186,7 +186,7 @@ PyObject* GeometryPy::clone(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<GeometryPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create clone of geometry");
         return nullptr;
diff --git a/src/Mod/Part/App/GeometrySurfacePyImp.cpp b/src/Mod/Part/App/GeometrySurfacePyImp.cpp
index 9e74b11b1f..7f7dafa72d 100644
--- a/src/Mod/Part/App/GeometrySurfacePyImp.cpp
+++ b/src/Mod/Part/App/GeometrySurfacePyImp.cpp
@@ -863,7 +863,7 @@ PyObject* GeometrySurfacePy::intersect(PyObject *args) const
                 GeometryCurvePy* curve = static_cast<GeometryCurvePy*>(p);
                 PyObject* t = PyTuple_New(2);
                 Py_INCREF(this);
-                PyTuple_SetItem(t, 0, this);
+                PyTuple_SetItem(t, 0, const_cast<GeometrySurfacePy*>(this));
                 PyTuple_SetItem(t, 1, PyFloat_FromDouble(prec));
                 return curve->intersectCS(t);
             } else {
diff --git a/src/Mod/Part/App/TopoShapePyImp.cpp b/src/Mod/Part/App/TopoShapePyImp.cpp
index e9c367aea7..f3513be0e0 100644
--- a/src/Mod/Part/App/TopoShapePyImp.cpp
+++ b/src/Mod/Part/App/TopoShapePyImp.cpp
@@ -1362,7 +1362,7 @@ PyObject*  TopoShapePy::reversed(PyObject *args) const
 
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<TopoShapePy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create copy of shape");
         return nullptr;
@@ -2342,7 +2342,7 @@ PyObject* TopoShapePy::defeaturing(PyObject *args) const
             );
         }
         PyTypeObject* type = this->GetType();
-        PyObject* inst = type->tp_new(type, this, nullptr);
+        PyObject* inst = type->tp_new(type, const_cast<TopoShapePy*>(this), nullptr);
         static_cast<TopoShapePy*>(inst)->getTopoShapePtr()->setShape
             (this->getTopoShapePtr()->defeaturing(shapes));
         return inst;
diff --git a/src/Mod/TechDraw/App/CenterLinePyImp.cpp b/src/Mod/TechDraw/App/CenterLinePyImp.cpp
index 694d985411..28aa49a4e2 100644
--- a/src/Mod/TechDraw/App/CenterLinePyImp.cpp
+++ b/src/Mod/TechDraw/App/CenterLinePyImp.cpp
@@ -63,7 +63,7 @@ PyObject* CenterLinePy::clone(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<CenterLinePy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_RuntimeError, "failed to create clone of CenterLine");
         return nullptr;
@@ -90,7 +90,7 @@ PyObject* CenterLinePy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<CenterLinePy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_RuntimeError, "failed to create copy of CenterLine");
         return nullptr;
diff --git a/src/Mod/TechDraw/App/CosmeticVertexPyImp.cpp b/src/Mod/TechDraw/App/CosmeticVertexPyImp.cpp
index 8f01328544..3b92e6c3fc 100644
--- a/src/Mod/TechDraw/App/CosmeticVertexPyImp.cpp
+++ b/src/Mod/TechDraw/App/CosmeticVertexPyImp.cpp
@@ -67,7 +67,7 @@ PyObject* CosmeticVertexPy::clone(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<CosmeticVertexPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create clone of CosmeticVertex");
         return nullptr;
@@ -95,7 +95,7 @@ PyObject* CosmeticVertexPy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<CosmeticVertexPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_TypeError, "failed to create copy of CosmeticVertex");
         return nullptr;
diff --git a/src/Mod/TechDraw/App/GeomFormatPyImp.cpp b/src/Mod/TechDraw/App/GeomFormatPyImp.cpp
index d9650f2e4c..4736eb4e77 100644
--- a/src/Mod/TechDraw/App/GeomFormatPyImp.cpp
+++ b/src/Mod/TechDraw/App/GeomFormatPyImp.cpp
@@ -58,7 +58,7 @@ PyObject* GeomFormatPy::clone(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<GeomFormatPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_RuntimeError, "failed to create clone of GeomFormat");
         return nullptr;
@@ -85,7 +85,7 @@ PyObject* GeomFormatPy::copy(PyObject *args) const
     PyObject* cpy = nullptr;
     // let the type object decide
     if (type->tp_new)
-        cpy = type->tp_new(type, this, nullptr);
+        cpy = type->tp_new(type, const_cast<GeomFormatPy*>(this), nullptr);
     if (!cpy) {
         PyErr_SetString(PyExc_RuntimeError, "failed to create copy of GeomFormat");
         return nullptr;