diff --git a/moon/init.lua b/moon/init.lua
index f05fe07..91d20e2 100644
--- a/moon/init.lua
+++ b/moon/init.lua
@@ -117,8 +117,7 @@ copy = function(self)
   end)()
 end
 mixin = function(self, cls, ...)
-  local meta = getmetatable(cls)
-  for key, val in pairs(meta.__index) do
+  for key, val in pairs(cls.__base) do
     if not key:match("^__") then
       self[key] = val
     end
diff --git a/moon/init.moon b/moon/init.moon
index 7fd6c59..ef07bba 100644
--- a/moon/init.moon
+++ b/moon/init.moon
@@ -100,8 +100,7 @@ copy = =>
 
 -- mixin class properties into self, call new
 mixin = (cls, ...) =>
-  meta = getmetatable cls
-  for key, val in pairs meta.__index
+  for key, val in pairs cls.__base
     self[key] = val if not key\match"^__"
   cls.__init self, ...