diff --git a/theories/algebra/ofe.v b/theories/algebra/ofe.v
index 23003d2d212c25304b6b8aab5928bca059589de1..7cb4ce262ec86924642b8bc1bbf768704b890800 100644
--- a/theories/algebra/ofe.v
+++ b/theories/algebra/ofe.v
@@ -1009,7 +1009,7 @@ Section sigma.
   Qed.
 End sigma.
 
-Arguments sigC {A} f.
+Arguments sigC {A} P.
 
 (** Notation for writing functors *)
 Notation "∙" := idCF : cFunctor_scope.