diff --git a/_CoqProject b/_CoqProject
index f32423842772913b2aeb2fe2ba2089236d9ffe13..87d2db87a1d51a4a759ead94a12e26b5769dd196 100644
--- a/_CoqProject
+++ b/_CoqProject
@@ -1,5 +1,5 @@
 -Q theories lrust
--arg -w -arg -notation-overridden,-redundant-canonical-projection,-projection-no-head-constant,-several-object-files
+-arg -w -arg -notation-overridden,-redundant-canonical-projection,-projection-no-head-constant,-several-object-files,-convert_concl_no_check
 theories/lifetime/model/boxes.v
 theories/lifetime/model/definitions.v
 theories/lifetime/model/faking.v