diff --git a/lib/libc/posix1e/cap_copy_int.3 b/lib/libc/posix1e/cap_copy_int.3
index 57682a4cbc2..91975635b52 100644
--- a/lib/libc/posix1e/cap_copy_int.3
+++ b/lib/libc/posix1e/cap_copy_int.3
@@ -39,7 +39,7 @@ working storage
 .In sys/types.h
 .In sys/capability.h
 .Ft cap_t
-.Fn cap_copy_int "void *ext_p"
+.Fn cap_copy_int "const void *ext_p"
 .Sh DESCRIPTION
 The
 .Fn cap_copy_int