diff --git a/include/wx/html/helpwnd.h b/include/wx/html/helpwnd.h
index 03c9704664..5d299a7159 100644
--- a/include/wx/html/helpwnd.h
+++ b/include/wx/html/helpwnd.h
@@ -9,8 +9,8 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifndef _WX_HELPWIN_H_
-#define _WX_HELPWIN_H_
+#ifndef _WX_HELPWND_H_
+#define _WX_HELPWND_H_
 
 #include "wx/defs.h"
 
@@ -327,3 +327,4 @@ END_DECLARE_EVENT_TYPES()
 #endif // wxUSE_WXHTML_HELP
 
 #endif
+