diff --git a/module/fs.lua b/module/fs.lua
index 0287eba..bc8e161 100644
--- a/module/fs.lua
+++ b/module/fs.lua
@@ -54,7 +54,7 @@ function fs.open(path,mode) -- string string -- table -- Opens file *path* with
   if mode:find("r") then
    fobj.read = fread
   end
-  if mode:find("w") then
+  if mode:find("w") or mode:find("a") then
    fobj.write = fwrite
   end
   return fobj