diff --git a/CHANGES.rst b/CHANGES.rst
index 25bf49e..fbb8ce2 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -634,6 +634,8 @@
 Bugfixes:
 
 - [#122] fix bug in FramedPacket
+- [#127] The Serial class in the .NET/Mono (IronPython) backend does not
+  implement the _reconfigure_port method
 
 Bugfixes (posix):
 
diff --git a/serial/serialcli.py b/serial/serialcli.py
index 9596f62..0727a52 100644
--- a/serial/serialcli.py
+++ b/serial/serialcli.py
@@ -47,7 +47,7 @@
         if self._dtr_state is None:
             self._dtr_state = True
 
-        self._reconfigurePort()
+        self._reconfigure_port()
         self._port_handle.Open()
         self.is_open = True
         if not self._dsrdtr:
@@ -56,7 +56,7 @@
             self._update_rts_state()
         self.reset_input_buffer()
 
-    def _reconfigurePort(self):
+    def _reconfigure_port(self):
         """Set communication parameters on opened port."""
         if not self._port_handle:
             raise SerialException("Can only operate on a valid port handle")