diff --git a/module/loadfile.lua b/module/loadfile.lua
index 5c73784..4e305e3 100644
--- a/module/loadfile.lua
+++ b/module/loadfile.lua
@@ -13,17 +13,18 @@ function os.spawnfile(p,n,...) -- spawns a new process from file *p* with name *
 end
 _G.libs = {computer=computer,component=component}
 function require(f) -- searches for a library with name *f* and returns what the library returns, if possible
- local lib = os.getenv("LIB") or "/boot/lib"
- for d in lib:gmatch("[^\n]+") do
-  if fs.exists(d.."/"..f) then
-   _G.libs[f] = runfile(d.."/"..f)
-  elseif fs.exists(d.."/"..f..".lua") then
-   _G.libs[f] = runfile(d.."/"..f..".lua")
+ if not _G.libs[f] then
+  local lib = os.getenv("LIB") or "/boot/lib"
+  for d in lib:gmatch("[^\n]+") do
+   if fs.exists(d.."/"..f) then
+    _G.libs[f] = runfile(d.."/"..f)
+   elseif fs.exists(d.."/"..f..".lua") then
+    _G.libs[f] = runfile(d.."/"..f..".lua")
+   end
   end
  end
  if _G.libs[f] then
   return _G.libs[f]
- else
-  error("library not found: "..f)
  end
+ error("library not found: "..f)
 end