diff --git a/luametalatex-init.lua b/luametalatex-init.lua
index ff66bf5..e1cd06a 100644
--- a/luametalatex-init.lua
+++ b/luametalatex-init.lua
@@ -19,7 +19,7 @@ do
   for _, a in ipairs(arg) do
     local name, value = arg_pattern:match(a)
     if name then
-      arg[name] = value
+      arg[name] = math.tointeger(value) or value
     end
   end
 end
diff --git a/luametalatex.lua b/luametalatex.lua
index d4e5fc9..26bcd40 100644
--- a/luametalatex.lua
+++ b/luametalatex.lua
@@ -4,6 +4,7 @@ local ourname = arg[0] -- This might not be os.selfarg[0]
 if os.selfarg[0] == ourname then
   ourname = nil
 end
+local run
 for i, a in ipairs(os.selfarg) do
   if a == ourname then -- Avoid recursion
     table.remove(os.selfarg, i)
@@ -18,6 +19,9 @@ for i, a in ipairs(os.selfarg) do
   if a:sub(1, 11) == "--progname=" then
     format = a:sub(12)
   end
+  if a:sub(1, 6) == "--run=" then
+    run = true
+  end
 end
 os.setenv("engine", status.luatex_engine)
 local kpse_call = io.popen(string.format("kpsewhich -progname %s -format lua -all -must-exist %s-init.lua", format, format))
@@ -28,5 +32,23 @@ until not file:match('^%.')
 if not kpse_call:close() then
   error(file)
 end
+
+local geterrorcode
+if os.type == 'windows' then
+  function geterrorcode(ec) return ec end
+else
+  function geterrorcode(ec) return ec & 0xFF == 0 and ec >> 8 or 0xFF end
+end
+
 local args = os.selfarg[1] and " \"" .. table.concat(os.selfarg, "\" \"") .. "\"" or ""
-os.exit(os.execute(string.format("luametatex \"--lua=%s\" --arg0=\"%s\"%s", file, os.selfarg[0], args)))
+if run then -- The user wants to take care of it
+  os.exit(geterrorcode(os.execute(string.format("luametatex \"--lua=%s\" --arg0=\"%s\"%s", file, os.selfarg[0], args))))
+else
+  for i = 1, 5 do
+    local status = geterrorcode(os.execute(string.format("luametatex \"--lua=%s\" --arg0=\"%s\" --run=%i%s", file, os.selfarg[0], i, args)))
+    if status ~= 75 then
+      os.exit(status)
+    end
+  end
+  os.exit(75)
+end