diff --git a/include/wx/string.h b/include/wx/string.h
index afa16e879b..3dae84626a 100644
--- a/include/wx/string.h
+++ b/include/wx/string.h
@@ -1078,11 +1078,19 @@ inline bool operator==(const wxString& s1, const wxWCharBuffer& s2)
     { return (s1.Cmp((const wchar_t *)s2) == 0); }
 inline bool operator==(const wxWCharBuffer& s1, const wxString& s2)
     { return (s2.Cmp((const wchar_t *)s1) == 0); }
+inline bool operator!=(const wxString& s1, const wxWCharBuffer& s2)
+    { return (s1.Cmp((const wchar_t *)s2) != 0); }
+inline bool operator!=(const wxWCharBuffer& s1, const wxString& s2)
+    { return (s2.Cmp((const wchar_t *)s1) != 0); }
 #else
 inline bool operator==(const wxString& s1, const wxCharBuffer& s2)
     { return (s1.Cmp((const char *)s2) == 0); }
 inline bool operator==(const wxCharBuffer& s1, const wxString& s2)
     { return (s2.Cmp((const char *)s1) == 0); }
+inline bool operator!=(const wxString& s1, const wxCharBuffer& s2)
+    { return (s1.Cmp((const char *)s2) != 0); }
+inline bool operator!=(const wxCharBuffer& s1, const wxString& s2)
+    { return (s2.Cmp((const char *)s1) != 0); }
 #endif
 
 wxString WXDLLEXPORT operator+(const wxString& string1,  const wxString& string2);