diff --git a/ChangeLog b/ChangeLog
index de22612a..f359c027 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2006-09-02  Federico Di Gregorio  <fog@initd.org>
 
+	* psycopg/adapter_mxdatetime.c, psycopg/psycopgmodule.c: fixed last
+	problem with non-constant initializers.
+
 	* psycopg/connection_type.c: applied patch from Joerg Sonnenberger
 	to fix a double mutex destroy.
 
diff --git a/psycopg/adapter_mxdatetime.c b/psycopg/adapter_mxdatetime.c
index 3b231489..3fcd238c 100644
--- a/psycopg/adapter_mxdatetime.c
+++ b/psycopg/adapter_mxdatetime.c
@@ -258,7 +258,7 @@ PyTypeObject mxdatetimeType = {
     0,          /*tp_dictoffset*/
     
     mxdatetime_init, /*tp_init*/
-    PyType_GenericAlloc, /*tp_alloc*/
+    0,          /*tp_alloc*/
     mxdatetime_new, /*tp_new*/
     (freefunc)mxdatetime_del, /*tp_free  Low-level free-memory routine */
     0,          /*tp_is_gc For PyObject_IS_GC */
diff --git a/psycopg/psycopgmodule.c b/psycopg/psycopgmodule.c
index 426fb27a..5f378568 100644
--- a/psycopg/psycopgmodule.c
+++ b/psycopg/psycopgmodule.c
@@ -667,6 +667,10 @@ init_psycopg(void)
 #ifdef HAVE_PYDATETIME
     pydatetimeType.tp_alloc = PyType_GenericAlloc;
 #endif
-    
+
+#ifdef HAVE_MXDATETIME
+    mxdatetimeType.tp_alloc = PyType_GenericAlloc;
+#endif
+
     Dprintf("initpsycopg: module initialization complete");
 }