diff --git a/ocaml/qp_run.ml b/ocaml/qp_run.ml
index 0cb862ae..bb886143 100644
--- a/ocaml/qp_run.ml
+++ b/ocaml/qp_run.ml
@@ -132,6 +132,7 @@ let run slave ?prefix exe ezfio_file =
   (** Run executable *)
   let prefix =
     match prefix with
+    | Some "gdb" -> "gdb --args "
     | Some x -> x^" "
     | None -> ""
   and exe =