diff --git a/dialog_windows.go b/dialog_windows.go
index d0a34ab..ab1c2dd 100644
--- a/dialog_windows.go
+++ b/dialog_windows.go
@@ -11,68 +11,6 @@ import (
 
 // TODO change what the default window titles are?
 
-// MessageBox button types.
-const (
-	_MB_ABORTRETRYIGNORE = 0x00000002
-	_MB_CANCELTRYCONTINUE = 0x00000006
-	_MB_HELP = 0x00004000
-	_MB_OK = 0x00000000
-	_MB_OKCANCEL = 0x00000001
-	_MB_RETRYCANCEL = 0x00000005
-	_MB_YESNO = 0x00000004
-	_MB_YESNOCANCEL = 0x00000003
-)
-
-// MessageBox icon types.
-const (
-	_MB_ICONEXCLAMATION = 0x00000030
-	_MB_ICONWARNING = 0x00000030
-	_MB_ICONINFORMATION = 0x00000040
-	_MB_ICONASTERISK = 0x00000040
-	_MB_ICONQUESTION = 0x00000020
-	_MB_ICONSTOP = 0x00000010
-	_MB_ICONERROR = 0x00000010
-	_MB_ICONHAND = 0x00000010
-)
-
-// MessageBox default button types.
-const (
-	_MB_DEFBUTTON1 = 0x00000000
-	_MB_DEFBUTTON2 = 0x00000100
-	_MB_DEFBUTTON3 = 0x00000200
-	_MB_DEFBUTTON4 = 0x00000300
-)
-
-// MessageBox modality types.
-const (
-	_MB_APPLMODAL = 0x00000000
-	_MB_SYSTEMMODAL = 0x00001000
-	_MB_TASKMODAL = 0x00002000
-)
-
-// MessageBox miscellaneous types.
-const (
-	_MB_DEFAULT_DESKTOP_ONLY = 0x00020000
-	_MB_RIGHT = 0x00080000
-	_MB_RTLREADING = 0x00100000
-	_MB_SETFOREGROUND = 0x00010000
-	_MB_TOPMOST = 0x00040000
-	_MB_SERVICE_NOTIFICATION = 0x00200000
-)
-
-// MessageBox return values.
-const (
-	_IDABORT = 3
-	_IDCANCEL = 2
-	_IDCONTINUE = 11
-	_IDIGNORE = 5
-	_IDNO = 7
-	_IDOK = 1
-	_IDRETRY = 4
-	_IDTRYAGAIN = 10
-	_IDYES = 6
-)
-
 var (
 	_messageBox = user32.NewProc("MessageBoxW")
 )
diff --git a/zconstants_windows_386.go b/zconstants_windows_386.go
index 26dbba9..3a63ddd 100644
--- a/zconstants_windows_386.go
+++ b/zconstants_windows_386.go
@@ -37,6 +37,8 @@ const _LB_GETSELITEMS = 401
 const _LB_GETTEXT = 393
 const _LB_GETTEXTLEN = 394
 const _LB_INSERTSTRING = 385
+const _MB_ICONERROR = 16
+const _MB_OK = 0
 const _MK_LBUTTON = 1
 const _MK_MBUTTON = 16
 const _MK_RBUTTON = 2