diff --git a/xbob/ip/flandmark/flandmark.cpp b/xbob/ip/flandmark/flandmark.cpp
index 2dfc39b836d05620b2841e6c00264aeba4744156..5dfd99ee402974400b916a02f771560d429e8090 100644
--- a/xbob/ip/flandmark/flandmark.cpp
+++ b/xbob/ip/flandmark/flandmark.cpp
@@ -31,6 +31,9 @@ static auto s_class = xbob::extension::ClassDoc(
     "You input an image and a bounding-box specification and it returns you the "
     "positions for multiple key-points for the given face image.\n"
     "\n"
+    "Consult http://cmp.felk.cvut.cz/~uricamic/flandmark/index.php for more "
+    "information.\n"
+    "\n"
     )
     .add_constructor(
         xbob::extension::FunctionDoc(
@@ -219,6 +222,8 @@ static PyObject* PyBobIpFlandmark_call_single(PyBobIpFlandmarkObject* self,
   if (!PyArg_ParseTupleAndKeywords(args, kwds, "O&iiii", kwlist,
         &PyBlitzArray_Converter, &image, &y, &x, &height, &width)) return 0;
 
+  auto image_ = make_safe(image);
+
   //check
   if (image->type_num != NPY_UINT8 || image->ndim != 2) {
     PyErr_Format(PyExc_TypeError, "`%s' input `image' data must be a 2D array with dtype `uint8' (i.e. a gray-scaled image), but you passed a %" PY_FORMAT_SIZE_T "d array with data type `%s'", Py_TYPE(self)->tp_name, image->ndim, PyBlitzArray_TypenumAsString(image->type_num));