diff --git a/src/Mod/Part/App/PartPyCXX.cpp b/src/Mod/Part/App/PartPyCXX.cpp
index b9ffe79b30..15b3c89fd5 100644
--- a/src/Mod/Part/App/PartPyCXX.cpp
+++ b/src/Mod/Part/App/PartPyCXX.cpp
@@ -80,3 +80,16 @@ PartExport Py::Object shape2pyshape(const TopoDS_Shape &shape)
     return Py::asObject(ret);
 }
 } //namespace Part
+
+
+namespace Py {
+    template<>
+    bool TopoShape::accepts (PyObject *pyob) const
+    {
+        return (pyob && PyObject_TypeCheck(pyob, &(Part::TopoShapePy::Type)));
+    }
+
+    // explicit template instantiation
+    template class PartExport ExtensionObject<Part::TopoShapePy>;
+}
+
diff --git a/src/Mod/Part/App/PartPyCXX.h b/src/Mod/Part/App/PartPyCXX.h
index eaa4bff5bc..e6ccaa2161 100644
--- a/src/Mod/Part/App/PartPyCXX.h
+++ b/src/Mod/Part/App/PartPyCXX.h
@@ -29,10 +29,7 @@
 namespace Py {
     typedef ExtensionObject<Part::TopoShapePy> TopoShape;
     template<>
-    bool TopoShape::accepts (PyObject *pyob) const
-    {
-        return (pyob && PyObject_TypeCheck(pyob, &(Part::TopoShapePy::Type)));
-    }
+    bool TopoShape::accepts (PyObject *pyob) const;
 }
 
 #endif //PART_PYCXX_H