diff --git a/silkmvc/core/mimes.lua b/silkmvc/core/mimes.lua
index 09f9d8c..01c22ff 100644
--- a/silkmvc/core/mimes.lua
+++ b/silkmvc/core/mimes.lua
@@ -42,11 +42,11 @@ end
 function std.extra_mime(name)
     local ext = utils.ext(name)
     local mpath = __ROOT__ .. "/" .. "mimes.json"
-    if WWW_ROOT and not utils.file_exists(mpath) then
+    if WWW_ROOT and not ulib.exists(mpath) then
         local mpath = WWW_ROOT .. "/" .. "mimes.json"
     end
     local xmimes = {}
-    if utils.file_exists(mpath) then
+    if ulib.exists(mpath) then
         xmimes = JSON.decodeFile(mpath)
     end
     if (name:find("Makefile$")) then