diff --git a/modules/lib/fs.lua b/modules/lib/fs.lua
index d5cd39e..e8ddd0b 100644
--- a/modules/lib/fs.lua
+++ b/modules/lib/fs.lua
@@ -237,7 +237,12 @@ function fs.cp(s,d)
  local df = fs.open(d,"wb")
  local sf = fs.open(s,"rb")
  if df and sf then
-  fs.write(df,fs.readall(sf))
+  local c = ""
+  while true do
+   c=fs.read(sf,2048)
+   if not c then break end
+   fs.write(df,c)
+  end
   fs.close(df)
   fs.close(sf)
   return true