diff --git a/oop/oop.lua b/oop/oop.lua
index 0a723bc..f28a6a3 100644
--- a/oop/oop.lua
+++ b/oop/oop.lua
@@ -307,6 +307,25 @@ function oop.install(env)
     target.isinstance = oop.isinstance
     target.issubclass = oop.issubclass
     target.Visibility = oop.Visibility
+
+    local mt = getmetatable(target)
+    if not mt then
+        mt = {}
+        setmetatable(target, mt)
+    end
+    local prev_newindex = mt.__newindex
+    mt.__newindex = function(t, k, v)
+        local val = v
+        if type(k) == "string" and type(v) == "function" and k:match("^[A-Z]") then
+            val = oop.class(v)
+            val.__name = k
+            function_def_cache[v] = val
+        end
+        if prev_newindex then
+            return prev_newindex(t, k, val)
+        end
+        rawset(t, k, val)
+    end
 end
 
 oop.install()