diff --git a/ocaml/qp_create_ezfio_from_xyz.ml b/ocaml/qp_create_ezfio_from_xyz.ml
index c79bf550..5bb3e8e7 100644
--- a/ocaml/qp_create_ezfio_from_xyz.ml
+++ b/ocaml/qp_create_ezfio_from_xyz.ml
@@ -21,6 +21,9 @@ let spec =
      ~doc:" Compute AOs in the Cartesian basis set (6d, 10f, ...)"
   +> anon ("(xyz_file|zmt_file)" %: file )
 
+type element =
+| Element of Element.t
+| Int_elem of (Nucl_number.t * Element.t)
 
 (** Handle dummy atoms placed on bonds *)
 let dummy_centers ~threshold ~molecule ~nuclei =
@@ -115,17 +118,14 @@ let run ?o b c d m p cart xyz_file =
   (* Open basis set channels *)
   let basis_channel element =
     let key =
-      Element.to_string element
+      match element with
+      | Element e -> Element.to_string e
+      | Int_elem (i,e) -> Printf.sprintf "%d,%s" (Nucl_number.to_int i)  (Element.to_string e)
     in
     match Hashtbl.find basis_table key with
     | Some in_channel -> 
         in_channel
-    | None -> 
-         let msg = 
-           Printf.sprintf "%s is not defined in basis %s.%!"
-           (Element.to_long_string element) b ;
-         in
-         failwith msg
+    | None -> raise Not_found
   in
   
   let temp_filename =
@@ -189,12 +189,21 @@ let run ?o b c d m p cart xyz_file =
       | Some (key, basis) -> (*Aux basis *)
         begin
           let elem  = 
-            Element.of_string key
+            try
+              Element (Element.of_string key)
+            with Element.ElementError _ ->
+              let result = 
+                match (String.split ~on:',' key) with
+                | i :: k :: [] -> (Nucl_number.of_int @@ int_of_string i, Element.of_string k)
+                | _ -> failwith "Expected format is int,Element:basis"
+              in Int_elem result
           and basis =
             String.lowercase basis
           in
           let key = 
-             Element.to_string elem
+             match elem with
+             | Element e -> Element.to_string e
+             | Int_elem (i,e) -> Printf.sprintf "%d,%s" (Nucl_number.to_int i) (Element.to_string e)
           in
           let new_channel =
             fetch_channel basis
@@ -202,7 +211,13 @@ let run ?o b c d m p cart xyz_file =
           begin
             match Hashtbl.add basis_table ~key:key ~data:new_channel with
             | `Ok -> ()
-            | `Duplicate -> failwith ("Duplicate definition of basis for "^(Element.to_long_string elem))
+            | `Duplicate ->
+              let e = 
+                match elem with
+                | Element e -> e
+                | Int_elem (_,e) -> e
+              in
+              failwith ("Duplicate definition of basis for "^(Element.to_long_string e))
           end
        end
     end;
@@ -537,7 +552,20 @@ let run ?o b c d m p cart xyz_file =
               | Element.X -> Element.H
               | e -> e
             in
-            Basis.read_element (basis_channel x.Atom.element) i e
+            let key =
+              Int_elem (i,x.Atom.element)
+            in
+            try
+              Basis.read_element (basis_channel key) i e
+            with Not_found ->
+              let key =
+                Element x.Atom.element
+              in
+              try
+                Basis.read_element (basis_channel key) i e
+              with Not_found ->
+                failwith (Printf.sprintf "Basis not found for atom %d (%s)" (Nucl_number.to_int i)
+                 (Element.to_string x.Atom.element) )
           with
           | End_of_file -> failwith
                 ("Element "^(Element.to_string x.Atom.element)^" not found in basis set.")