diff --git a/_CoqProject b/_CoqProject
index f1603fdec68fc261b0cabf0c11a8ec05ec8c4514..20c25c63dc6b1c6f073f994cb3eba20c5d0592c6 100644
--- a/_CoqProject
+++ b/_CoqProject
@@ -1,5 +1,5 @@
 -Q theories actris
--arg -w -arg -notation-overridden,-redundant-canonical-projection,-several-object-files,-convert_concl_no_check,-undeclared-scope,-ambiguous-paths
+-arg -w -arg -notation-overridden,-redundant-canonical-projection,-several-object-files,-convert_concl_no_check,-undeclared-scope,-ambiguous-paths,-unexpected-implicit-declaration
 theories/utils/skip.v
 theories/utils/llist.v
 theories/utils/compare.v