diff --git a/sw/logalizer/sd2log.ml b/sw/logalizer/sd2log.ml
index 8f39404221..f3299f9f92 100644
--- a/sw/logalizer/sd2log.ml
+++ b/sw/logalizer/sd2log.ml
@@ -128,12 +128,13 @@ let xml_parse_compressed_file = fun file ->
 let md5_ofs = 3*6+1
 let md5_len = 32
 let search_conf = fun md5 ->
-  let files = Sys.readdir var_path in
+  let dir = var_path // "conf" in
+  let files = Sys.readdir dir in
   let rec loop = fun i ->
     if i < Array.length files then begin
       if String.length files.(i) > (md5_ofs + md5_len)
 	  && String.sub files.(i) md5_ofs md5_len = md5 then
-	var_path // files.(i)
+	dir // files.(i)
       else
 	loop (i+1)
     end else
diff --git a/sw/tools/gen_aircraft.ml b/sw/tools/gen_aircraft.ml
index 26f3aefa09..891ba5c370 100644
--- a/sw/tools/gen_aircraft.ml
+++ b/sw/tools/gen_aircraft.ml
@@ -228,7 +228,9 @@ let () =
     (** Save the configuration for future use *)
     let d = U.localtime (U.gettimeofday ()) in
     let filename = sprintf "%02d_%02d_%02d__%02d_%02d_%02d_%s_%s.conf" (d.U.tm_year mod 100) (d.U.tm_mon+1) (d.U.tm_mday) (d.U.tm_hour) (d.U.tm_min) (d.U.tm_sec) md5sum aircraft in
-    let f = open_out (Env.paparazzi_home // "var" // filename) in
+    let d = Env.paparazzi_home // "var" // "conf" in
+    mkdir d;
+    let f = open_out (d // filename) in
     Printf.fprintf f "%s\n" (ExtXml.to_string_fmt configuration);
     close_out f end;