diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 01757614ee..e59a6f95e1 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -114,6 +114,15 @@ void SketchGeometryExtension::Restore(Base::XMLReader &reader)
     id = reader.getAttributeAsInteger("id");
 }
 
+std::unique_ptr<Part::GeometryExtension> SketchGeometryExtension::copy(void) const
+{
+    std::unique_ptr<SketchGeometryExtension> cpy = std::make_unique<SketchGeometryExtension>();
+
+    cpy->id = this->id;
+
+    return std::move(cpy);
+}
+
 PyObject * SketchGeometryExtension::getPyObject(void)
 {
     return 0;
diff --git a/src/Mod/Sketcher/App/SketchObject.h b/src/Mod/Sketcher/App/SketchObject.h
index 5337f1f5e2..164e721204 100644
--- a/src/Mod/Sketcher/App/SketchObject.h
+++ b/src/Mod/Sketcher/App/SketchObject.h
@@ -52,6 +52,8 @@ public:
     virtual void Save(Base::Writer &/*writer*/) const;
     virtual void Restore(Base::XMLReader &/*reader*/);
 
+    virtual std::unique_ptr<Part::GeometryExtension> copy(void) const;
+
     virtual PyObject *getPyObject(void);
 
 public: