diff --git a/pkgs/racket-doc/scribblings/foreign/types.scrbl b/pkgs/racket-doc/scribblings/foreign/types.scrbl
index d23f3de947..e84b4a3555 100644
--- a/pkgs/racket-doc/scribblings/foreign/types.scrbl
+++ b/pkgs/racket-doc/scribblings/foreign/types.scrbl
@@ -1735,7 +1735,7 @@ a-union-val
 ]}
 
 
-@defproc[(union-ptr [u array?]) cpointer?]{
+@defproc[(union-ptr [u union?]) cpointer?]{
 
 Extracts the pointer for a union's storage.