Index: Lib/ctypes/test/test_callbacks.py
===================================================================
--- Lib/ctypes/test/test_callbacks.py	(revision 81268)
+++ Lib/ctypes/test/test_callbacks.py	(working copy)
@@ -174,5 +174,22 @@
 
 ################################################################
 
+class ArrayCallbacks(Callbacks):
+    def callback(self, a):
+        self.a0 = a[0]
+
+    def check_type(self, typ, arg):
+        A = typ * 1
+        PROTO = CFUNCTYPE(None, A)
+        PROTO(self.callback)(A(arg))
+        if typ == c_float:
+            self.assertAlmostEqual(self.a0, arg, places=5)
+        else:
+            self.assertEqual(self.a0, arg)
+
+    def test_int(self):
+        self.check_type(c_int, 42)
+################################################################
+
 if __name__ == '__main__':
     unittest.main()
Index: Lib/ctypes/__init__.py
===================================================================
--- Lib/ctypes/__init__.py	(revision 81268)
+++ Lib/ctypes/__init__.py	(working copy)
@@ -101,6 +101,16 @@
     try:
         return _c_functype_cache[(restype, argtypes, flags)]
     except KeyError:
+        # decay array args to pointers
+        PyCArrayType = type(c_int * 1) # XXX: Any better way to import PyCArrayType?
+        arrayargs = [(i, t) for i, t in enumerate(argtypes)
+                     if isinstance(t, PyCArrayType)]
+        if arrayargs:
+            argtypeslist = list(argtypes)
+            for i, t in arrayargs:
+                argtypeslist[i] = POINTER(t._type_)
+            argtypes = tuple(argtypeslist)
+            
         class CFunctionType(_CFuncPtr):
             _argtypes_ = argtypes
             _restype_ = restype