diff --git a/programs/demos/magnify/trunk/Tupfile.lua b/programs/demos/magnify/trunk/Tupfile.lua
index f5b075ae5..c84d51e13 100644
--- a/programs/demos/magnify/trunk/Tupfile.lua
+++ b/programs/demos/magnify/trunk/Tupfile.lua
@@ -1,7 +1,4 @@
 if tup.getconfig("NO_FASM") ~= "" then return end
 HELPERDIR = (tup.getconfig("HELPERDIR") == "") and "../../.." or tup.getconfig("HELPERDIR")
 tup.include(HELPERDIR .. "/use_fasm.lua")
-add_include(tup.getvariantdir())
-
-tup.rule("echo lang fix " .. ((tup.getconfig("LANG") == "") and "en_US" or tup.getconfig("LANG")) .. " > %o", {"lang.inc"})
-tup.rule({"magnify.asm", extra_inputs = {"lang.inc"}}, FASM .. " %f %o " .. tup.getconfig("KPACK_CMD"), "magnify")
+tup.rule("magnify.asm", FASM .. " -dlang=" .. tup.getconfig("LANG") .. " %f %o" .. tup.getconfig("KPACK_CMD"), "%B")
diff --git a/programs/demos/magnify/trunk/build_es.bat b/programs/demos/magnify/trunk/build_es.bat
new file mode 100644
index 000000000..9a36c0f88
--- /dev/null
+++ b/programs/demos/magnify/trunk/build_es.bat
@@ -0,0 +1,6 @@
+@erase lang.inc
+@echo lang fix es_ES >lang.inc
+@fasm magnify.asm magnify
+@kpack magnify
+@erase lang.inc
+@pause