diff --git a/extra/webapps/mason/mason.factor b/extra/webapps/mason/mason.factor
index f7aadb9a54..9867038ef1 100644
--- a/extra/webapps/mason/mason.factor
+++ b/extra/webapps/mason/mason.factor
@@ -139,14 +139,14 @@ CONSTANT: cpus
             { "macosx" "Mac OS X 10.5 Leopard" }
             { "linux" "Ubuntu Linux 9.04 (other distributions may also work)" }
             { "freebsd" "FreeBSD 7.0" }
-            { "netbsd" "NetBSD 4.0" }
+            { "netbsd" "NetBSD 5.0" }
             { "openbsd" "OpenBSD 4.4" }
         } at
     ] [
         dup cpu>> "x86.32" = [
             os>> {
-                { [ dup { "winnt" "linux" "freebsd" } member? ] [ drop "Intel Pentium 4, Core Duo, or other x86 chip with SSE2 support. Note that 32-bit Athlon XP processors do not support SSE2." ] }
-                { [ dup { "netbsd" "openbsd" } member? ] [ drop "Intel Pentium Pro or better" ] }
+                { [ dup { "winnt" "linux" "freebsd"  "netbsd" } member? ] [ drop "Intel Pentium 4, Core Duo, or other x86 chip with SSE2 support. Note that 32-bit Athlon XP processors do not support SSE2." ] }
+                { [ dup {"openbsd" } member? ] [ drop "Intel Pentium Pro or better" ] }
                 { [ t ] [ drop f ] }
             } cond
         ] [ drop f ] if