diff --git a/extra/webapps/mason/grids/grids.factor b/extra/webapps/mason/grids/grids.factor
index 10add7727f..8c888b501c 100644
--- a/extra/webapps/mason/grids/grids.factor
+++ b/extra/webapps/mason/grids/grids.factor
@@ -18,8 +18,6 @@ CONSTANT: oses
     { "windows" "Windows" }
     { "macosx" "Mac OS X" }
     { "linux" "Linux" }
-    { "freebsd" "FreeBSD" }
-    { "openbsd" "OpenBSD" }
 }
 
 CONSTANT: cpus
diff --git a/extra/webapps/mason/utils/utils.factor b/extra/webapps/mason/utils/utils.factor
index 47e2e68376..5fa60c6fa0 100644
--- a/extra/webapps/mason/utils/utils.factor
+++ b/extra/webapps/mason/utils/utils.factor
@@ -27,9 +27,6 @@ IN: webapps.mason.utils
             { "windows" "Windows XP, Windows Vista or Windows 7" }
             { "macosx" "Mac OS X 10.5 Leopard" }
             { "linux" "Ubuntu Linux 9.04 (other distributions may also work)" }
-            { "freebsd" "FreeBSD 7.1" }
-            { "netbsd" "NetBSD 5.0" }
-            { "openbsd" "OpenBSD 4.5" }
         } at
     ] [
         dup cpu>> "x86.32" = [