diff --git a/psycopg/column_type.c b/psycopg/column_type.c
index 8ee7d4c4..f024a12d 100644
--- a/psycopg/column_type.c
+++ b/psycopg/column_type.c
@@ -248,7 +248,7 @@ static PySequenceMethods column_sequence = {
 
 
 static PyObject *
-column_getstate(columnObject *self)
+column_getstate(columnObject *self, PyObject *dummy)
 {
     return PyObject_CallFunctionObjArgs(
         (PyObject *)&PyTuple_Type, (PyObject *)self, NULL);
diff --git a/psycopg/connection_type.c b/psycopg/connection_type.c
index af9183ed..f531113e 100644
--- a/psycopg/connection_type.c
+++ b/psycopg/connection_type.c
@@ -138,7 +138,7 @@ exit:
 #define psyco_conn_close_doc "close() -- Close the connection."
 
 static PyObject *
-psyco_conn_close(connectionObject *self)
+psyco_conn_close(connectionObject *self, PyObject *dummy)
 {
     Dprintf("psyco_conn_close: closing connection at %p", self);
     conn_close(self);
@@ -153,7 +153,7 @@ psyco_conn_close(connectionObject *self)
 #define psyco_conn_commit_doc "commit() -- Commit all changes to database."
 
 static PyObject *
-psyco_conn_commit(connectionObject *self)
+psyco_conn_commit(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
     EXC_IF_CONN_ASYNC(self, commit);
@@ -172,7 +172,7 @@ psyco_conn_commit(connectionObject *self)
 "rollback() -- Roll back all changes done to database."
 
 static PyObject *
-psyco_conn_rollback(connectionObject *self)
+psyco_conn_rollback(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
     EXC_IF_CONN_ASYNC(self, rollback);
@@ -245,7 +245,7 @@ exit:
 "tpc_prepare() -- perform the first phase of a two-phase transaction."
 
 static PyObject *
-psyco_conn_tpc_prepare(connectionObject *self)
+psyco_conn_tpc_prepare(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
     EXC_IF_CONN_ASYNC(self, tpc_prepare);
@@ -388,7 +388,7 @@ psyco_conn_tpc_rollback(connectionObject *self, PyObject *args)
 "tpc_recover() -- returns a list of pending transaction IDs."
 
 static PyObject *
-psyco_conn_tpc_recover(connectionObject *self)
+psyco_conn_tpc_recover(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
     EXC_IF_CONN_ASYNC(self, tpc_recover);
@@ -403,7 +403,7 @@ psyco_conn_tpc_recover(connectionObject *self)
 "__enter__ -> self"
 
 static PyObject *
-psyco_conn_enter(connectionObject *self)
+psyco_conn_enter(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
 
@@ -828,7 +828,7 @@ psyco_conn_deferrable_set(connectionObject *self, PyObject *pyvalue)
 "get_native_connection() -- Return the internal PGconn* as a Python Capsule."
 
 static PyObject *
-psyco_get_native_connection(connectionObject *self)
+psyco_get_native_connection(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
 
@@ -866,7 +866,7 @@ psyco_conn_set_client_encoding(connectionObject *self, PyObject *args)
 "get_transaction_status() -- Get backend transaction status."
 
 static PyObject *
-psyco_conn_get_transaction_status(connectionObject *self)
+psyco_conn_get_transaction_status(connectionObject *self, PyObject *dummy)
 {
     return PyInt_FromLong((long)PQtransactionStatus(self->pgconn));
 }
@@ -905,7 +905,7 @@ psyco_conn_get_parameter_status(connectionObject *self, PyObject *args)
 "get_dsn_parameters() -- Get effective connection parameters.\n\n"
 
 static PyObject *
-psyco_conn_get_dsn_parameters(connectionObject *self)
+psyco_conn_get_dsn_parameters(connectionObject *self, PyObject *dummy)
 {
 #if PG_VERSION_NUM >= 90300
     PyObject *res = NULL;
@@ -998,7 +998,7 @@ psyco_conn_lobject(connectionObject *self, PyObject *args, PyObject *keywds)
 "get_backend_pid() -- Get backend process id."
 
 static PyObject *
-psyco_conn_get_backend_pid(connectionObject *self)
+psyco_conn_get_backend_pid(connectionObject *self, PyObject *dummy)
 {
     EXC_IF_CONN_CLOSED(self);
 
@@ -1025,7 +1025,7 @@ psyco_conn_info_get(connectionObject *self)
 "reset() -- Reset current connection to defaults."
 
 static PyObject *
-psyco_conn_reset(connectionObject *self)
+psyco_conn_reset(connectionObject *self, PyObject *dummy)
 {
     int res;
 
@@ -1056,7 +1056,7 @@ psyco_conn_get_exception(PyObject *self, void *closure)
 "poll() -> int -- Advance the connection or query process without blocking."
 
 static PyObject *
-psyco_conn_poll(connectionObject *self)
+psyco_conn_poll(connectionObject *self, PyObject *dummy)
 {
     int res;
 
@@ -1076,7 +1076,7 @@ psyco_conn_poll(connectionObject *self)
 "fileno() -> int -- Return file descriptor associated to database connection."
 
 static PyObject *
-psyco_conn_fileno(connectionObject *self)
+psyco_conn_fileno(connectionObject *self, PyObject *dummy)
 {
     long int socket;
 
@@ -1093,7 +1093,7 @@ psyco_conn_fileno(connectionObject *self)
  "executing an asynchronous operation."
 
 static PyObject *
-psyco_conn_isexecuting(connectionObject *self)
+psyco_conn_isexecuting(connectionObject *self, PyObject *dummy)
 {
     /* synchronous connections will always return False */
     if (self->async == 0) {
@@ -1119,7 +1119,7 @@ psyco_conn_isexecuting(connectionObject *self)
 "cancel() -- cancel the current operation"
 
 static PyObject *
-psyco_conn_cancel(connectionObject *self)
+psyco_conn_cancel(connectionObject *self, PyObject *dummy)
 {
     char errbuf[256];
 
diff --git a/psycopg/cursor_type.c b/psycopg/cursor_type.c
index d5d12f07..591f5b32 100644
--- a/psycopg/cursor_type.c
+++ b/psycopg/cursor_type.c
@@ -47,7 +47,7 @@
 "close() -- Close the cursor."
 
 static PyObject *
-psyco_curs_close(cursorObject *self)
+psyco_curs_close(cursorObject *self, PyObject *dummy)
 {
     PyObject *rv = NULL;
     char *lname = NULL;
@@ -756,7 +756,7 @@ exit:
 }
 
 static PyObject *
-psyco_curs_fetchone(cursorObject *self)
+psyco_curs_fetchone(cursorObject *self, PyObject *dummy)
 {
     PyObject *res;
 
@@ -947,7 +947,7 @@ exit:
 "Return `!None` when no more data is available.\n"
 
 static PyObject *
-psyco_curs_fetchall(cursorObject *self)
+psyco_curs_fetchall(cursorObject *self, PyObject *dummy)
 {
     int i, size;
     PyObject *list = NULL;
@@ -1162,7 +1162,7 @@ exit:
 "sets) and will raise a NotSupportedError exception."
 
 static PyObject *
-psyco_curs_nextset(cursorObject *self)
+psyco_curs_nextset(cursorObject *self, PyObject *dummy)
 {
     EXC_IF_CURS_CLOSED(self);
 
@@ -1279,7 +1279,7 @@ psyco_curs_scroll(cursorObject *self, PyObject *args, PyObject *kwargs)
 "__enter__ -> self"
 
 static PyObject *
-psyco_curs_enter(cursorObject *self)
+psyco_curs_enter(cursorObject *self, PyObject *dummy)
 {
     Py_INCREF(self);
     return (PyObject *)self;
@@ -1768,7 +1768,7 @@ cursor_next(PyObject *self)
 
     if (NULL == ((cursorObject*)self)->name) {
         /* we don't parse arguments: psyco_curs_fetchone will do that for us */
-        res = psyco_curs_fetchone((cursorObject*)self);
+        res = psyco_curs_fetchone((cursorObject*)self, NULL);
 
         /* convert a None to NULL to signal the end of iteration */
         if (res && res == Py_None) {
diff --git a/psycopg/error_type.c b/psycopg/error_type.c
index 4ab21915..6dfdb527 100644
--- a/psycopg/error_type.c
+++ b/psycopg/error_type.c
@@ -131,7 +131,7 @@ static struct PyGetSetDef error_getsets[] = {
  * would require implementing __getstate__, and as of 2012 it's a little
  * bit too late to care. */
 static PyObject *
-psyco_error_reduce(errorObject *self)
+psyco_error_reduce(errorObject *self, PyObject *dummy)
 {
     PyObject *meth = NULL;
     PyObject *tuple = NULL;
diff --git a/psycopg/psycopgmodule.c b/psycopg/psycopgmodule.c
index c8c2bf79..abff26da 100644
--- a/psycopg/psycopgmodule.c
+++ b/psycopg/psycopgmodule.c
@@ -396,7 +396,7 @@ exit:
 #define psyco_libpq_version_doc "Query actual libpq version loaded."
 
 static PyObject*
-psyco_libpq_version(PyObject *self)
+psyco_libpq_version(PyObject *self, PyObject *dummy)
 {
     return PyInt_FromLong(PQlibVersion());
 }
diff --git a/psycopg/replication_cursor_type.c b/psycopg/replication_cursor_type.c
index 0c0578bf..91e0cde5 100644
--- a/psycopg/replication_cursor_type.c
+++ b/psycopg/replication_cursor_type.c
@@ -140,7 +140,7 @@ psyco_repl_curs_consume_stream(replicationCursorObject *self,
 "read_message() -- Try reading a replication message from the server (non-blocking)."
 
 static PyObject *
-psyco_repl_curs_read_message(replicationCursorObject *self)
+psyco_repl_curs_read_message(replicationCursorObject *self, PyObject *dummy)
 {
     cursorObject *curs = &self->cur;
     replicationMessageObject *msg = NULL;