diff --git a/sw/lib/ocaml/pprz.ml b/sw/lib/ocaml/pprz.ml
index 1f0f7af96a..a43150db0e 100644
--- a/sw/lib/ocaml/pprz.ml
+++ b/sw/lib/ocaml/pprz.ml
@@ -167,6 +167,12 @@ let rec string_of_value = function
 
 let magic = fun x -> (Obj.magic x:('a,'b,'c) Pervasives.format)
 
+(* FIXME temporary solution, the complete formatted_string_of_value function
+   causes a segfault in server and GCS *)
+let string_of_value_format = fun format v ->
+  match v with
+    Float x -> sprintf (magic format) x
+  | v -> string_of_value v
 
 let rec formatted_string_of_value = fun format v ->
   match v with
@@ -717,7 +723,7 @@ module MessagesOfXml(Class:CLASS_Xml) = struct
          try List.assoc field_name values with
              Not_found ->
                default_value field._type in
-       formatted_string_of_value field.fformat v)
+       string_of_value_format field.fformat v)
      msg.fields)
 
   let message_send = fun ?timestamp ?link_id sender msg_name values ->