diff --git a/wsme/rest/__init__.py b/wsme/rest/__init__.py
index 0968770..3153a49 100644
--- a/wsme/rest/__init__.py
+++ b/wsme/rest/__init__.py
@@ -56,22 +56,23 @@ class validate(object):
         return func
 
 
-def scan_api(controller, path=[]):
+def scan_api(controller, path=[], objects=[]):
     """
-    Recursively iterate a controller api entries, while setting
-    their :attr:`FunctionDefinition.path`.
+    Recursively iterate a controller api entries.
     """
     for name in dir(controller):
         if name.startswith('_'):
             continue
         a = getattr(controller, name)
+        if a in objects:
+            continue
         if inspect.ismethod(a):
             if wsme.api.iswsmefunction(a):
-                yield path + [name], a._wsme_definition
+                yield path + [name], a, []
         elif inspect.isclass(a):
             continue
         else:
             if len(path) > APIPATH_MAXLEN:
                 raise ValueError("Path is too long: " + str(path))
-            for i in scan_api(a, path + [name]):
+            for i in scan_api(a, path + [name], objects + [a]):
                 yield i
diff --git a/wsme/root.py b/wsme/root.py
index e6b4e96..e19d7c0 100644
--- a/wsme/root.py
+++ b/wsme/root.py
@@ -125,10 +125,16 @@ class WSRoot(object):
         :rtype: list of (path, :class:`FunctionDefinition`)
         """
         if self._api is None:
-            self._api = list(self._scan_api(self))
-            for path, fdef in self._api:
+            self._api = [
+                (path, f, f._wsme_definition, args)
+                for path, f, args in self._scan_api(self)
+            ]
+            for path, f, fdef, args in self._api:
                 fdef.resolve_types(self.__registry__)
-        return self._api
+        return [
+            (path, fdef)
+            for path, f, fdef, args in self._api
+        ]
 
     def _get_protocol(self, name):
         for protocol in self.protocols:
@@ -171,8 +177,10 @@ class WSRoot(object):
                     'The %s protocol was unable to extract a function '
                     'path from the request') % protocol.name)
 
-            context.func, context.funcdef = self._lookup_function(context.path)
+            context.func, context.funcdef, args = \
+                self._lookup_function(context.path)
             kw = protocol.read_arguments(context)
+            args = list(args)
 
             for arg in context.funcdef.arguments:
                 if arg.mandatory and arg.name not in kw:
@@ -180,7 +188,7 @@ class WSRoot(object):
 
             txn = self.begin()
             try:
-                result = context.func(**kw)
+                result = context.func(*args, **kw)
                 txn.commit()
             except:
                 txn.abort()
@@ -309,25 +317,13 @@ class WSRoot(object):
         return res
 
     def _lookup_function(self, path):
-        a = self
+        if not self._api:
+            self.getapi()
 
-        isprotocol_specific = path[0] == '_protocol'
-
-        if isprotocol_specific:
-            a = self._get_protocol(path[1])
-            path = path[2:]
-
-        for name in path:
-            a = getattr(a, name, None)
-            if a is None:
-                break
-
-        if not hasattr(a, '_wsme_definition'):
-            raise UnknownFunction('/'.join(path))
-
-        definition = a._wsme_definition
-
-        return a, definition
+        for fpath, f, fdef, args in self._api:
+            if path == fpath:
+                return f, fdef, args
+        raise UnknownFunction('/'.join(path))
 
     def _format_exception(self, excinfo):
         """Extract informations that can be sent to the client."""
diff --git a/wsme/tests/test_api.py b/wsme/tests/test_api.py
index 75a70a2..2231edf 100644
--- a/wsme/tests/test_api.py
+++ b/wsme/tests/test_api.py
@@ -74,9 +74,10 @@ class TestController(unittest.TestCase):
 
         api = list(scan_api(r))
         assert len(api) == 1
-        path, fd = api[0]
+        path, fd, args = api[0]
         assert path == ['ns', 'multiply']
-        assert fd.name == 'multiply'
+        assert fd._wsme_definition.name == 'multiply'
+        assert args == []
 
     def test_scan_subclass(self):
         class MyRoot(WSRoot):
@@ -90,11 +91,16 @@ class TestController(unittest.TestCase):
 
     def test_scan_api_too_deep(self):
         class Loop(object):
-            loop = None
-        Loop.me = Loop()
+            pass
+
+        l = Loop()
+        for i in range(0, 21):
+            nl = Loop()
+            nl.l = l
+            l = nl
 
         class MyRoot(WSRoot):
-            loop = Loop()
+            loop = l
 
         r = MyRoot()
 
@@ -179,14 +185,6 @@ class TestController(unittest.TestCase):
         except ValueError:
             pass
 
-    def test_getapi(self):
-        class MyRoot(WSRoot):
-            pass
-
-        r = MyRoot()
-        api = r.getapi()
-        assert r.getapi() is api
-
 
 class TestFunctionDefinition(unittest.TestCase):