diff --git a/wxPython/src/__controls_rename.i b/wxPython/src/__controls_rename.i
index 10b7e9a76d..014ef676de 100644
--- a/wxPython/src/__controls_rename.i
+++ b/wxPython/src/__controls_rename.i
@@ -7,6 +7,7 @@
 %rename(BU_TOP)                             wxBU_TOP;
 %rename(BU_RIGHT)                           wxBU_RIGHT;
 %rename(BU_BOTTOM)                          wxBU_BOTTOM;
+%rename(BU_ALIGN_MASK)                      wxBU_ALIGN_MASK;
 %rename(BU_EXACTFIT)                        wxBU_EXACTFIT;
 %rename(BU_AUTODRAW)                        wxBU_AUTODRAW;
 %rename(Button)                             wxButton;
diff --git a/wxPython/src/_button.i b/wxPython/src/_button.i
index 53af38d7b0..07d48438ca 100644
--- a/wxPython/src/_button.i
+++ b/wxPython/src/_button.i
@@ -24,6 +24,8 @@ enum {
     wxBU_RIGHT,
     wxBU_BOTTOM,
 
+    wxBU_ALIGN_MASK,
+
     wxBU_EXACTFIT,
     wxBU_AUTODRAW,
 };
diff --git a/wxPython/wxPython/_controls.py b/wxPython/wxPython/_controls.py
index 68e45d6a30..7105da1930 100644
--- a/wxPython/wxPython/_controls.py
+++ b/wxPython/wxPython/_controls.py
@@ -24,6 +24,7 @@ wxBU_LEFT = wx._controls.BU_LEFT
 wxBU_TOP = wx._controls.BU_TOP
 wxBU_RIGHT = wx._controls.BU_RIGHT
 wxBU_BOTTOM = wx._controls.BU_BOTTOM
+wxBU_ALIGN_MASK = wx._controls.BU_ALIGN_MASK
 wxBU_EXACTFIT = wx._controls.BU_EXACTFIT
 wxBU_AUTODRAW = wx._controls.BU_AUTODRAW
 wxButton = wx._controls.Button