diff --git a/_CoqProject b/_CoqProject
index a5316e76dc2151fca37eb29249a85f8d349f00b3..970b60997fb86927f8c49526cbedb89cef8ff48d 100644
--- a/_CoqProject
+++ b/_CoqProject
@@ -4,6 +4,8 @@
 # Cannot use non-canonical projections as it causes massive unification failures
 # (https://github.com/coq/coq/issues/6294).
 -arg -w -arg -redundant-canonical-projection
+# https://gitlab.mpi-sws.org/iris/stdpp/-/issues/216
+-arg -w -arg -notation-incompatible-prefix
 
 theories/barrier/proof.v
 theories/barrier/specification.v