diff --git a/builder/sources.ml b/builder/sources.ml
index e7644a283..be1c27d26 100644
--- a/builder/sources.ml
+++ b/builder/sources.ml
@@ -35,7 +35,7 @@ let parse_conf ~prog ~debug file =
   if debug then (
     eprintf (f_"%s: trying to read %s\n") prog file;
   );
-  let sections = Ini_reader.read_ini ~prog file in
+  let sections = Ini_reader.read_ini ~prog ~error_suffix:"[ignored]" file in
 
   let sources = List.fold_right (
     fun (n, fields) acc ->