diff --git a/src/Gui/View3DPy.cpp b/src/Gui/View3DPy.cpp
index 0d0572c99..1fd6e034e 100644
--- a/src/Gui/View3DPy.cpp
+++ b/src/Gui/View3DPy.cpp
@@ -464,7 +464,7 @@ Py::Object View3DInventorPy::viewRotateRight(const Py::Tuple& args)
 Py::Object View3DInventorPy::setCameraOrientation(const Py::Tuple& args)
 {
     PyObject* o;
-    PyObject* m;
+    PyObject* m=0;
     if (!PyArg_ParseTuple(args.ptr(), "O!|O!", &PyTuple_Type, &o, &PyBool_Type, &m))
         throw Py::Exception();