diff --git a/pkgs/racket-doc/scribblings/reference/mpairs.scrbl b/pkgs/racket-doc/scribblings/reference/mpairs.scrbl
index 1fec9f2602..03f9b29a57 100644
--- a/pkgs/racket-doc/scribblings/reference/mpairs.scrbl
+++ b/pkgs/racket-doc/scribblings/reference/mpairs.scrbl
@@ -39,13 +39,13 @@ element is @racket[a] and second element is @racket[d].}
 @tech{mutable pair} @racket[p].}
 
 
-@defproc[(set-mcar! [p mpair?] [v any/v]) 
+@defproc[(set-mcar! [p mpair?] [v any/c]) 
          void?]{
 
 Changes the @tech{mutable pair} @racket[p] so that its first element is
 @racket[v].}
 
-@defproc[(set-mcdr! [p mpair?] [v any/v]) 
+@defproc[(set-mcdr! [p mpair?] [v any/c]) 
          void?]{
 
 Changes the @tech{mutable pair} @racket[p] so that its second element is