diff --git a/lib/libc/sys/sigaltstack.2 b/lib/libc/sys/sigaltstack.2
index f1ed718eb966..4892a923fcbd 100644
--- a/lib/libc/sys/sigaltstack.2
+++ b/lib/libc/sys/sigaltstack.2
@@ -71,7 +71,7 @@ the system arranges a switch to the signal stack for the
 duration of the signal handler's execution. 
 .Pp
 If
-.Dv SA_DISABLE
+.Dv SS_DISABLE
 is set in
 .Fa ss_flags ,
 .Fa ss_sp
@@ -95,9 +95,9 @@ is non-zero, the current signal stack state is returned.
 The
 .Fa ss_flags
 field will contain the value
-.Dv SA_ONSTACK
+.Dv SS_ONSTACK
 if the process is currently on a signal stack and
-.Dv SA_DISABLE
+.Dv SS_DISABLE
 if the signal stack is currently disabled.
 .Sh NOTES
 The value