diff --git a/include/wx/strvararg.h b/include/wx/strvararg.h
index cc14ce2ddb..21977e8e40 100644
--- a/include/wx/strvararg.h
+++ b/include/wx/strvararg.h
@@ -408,6 +408,12 @@ wxFORMAT_STRING_SPECIFIER(long double, wxFormatString::Arg_LongDouble)
 wxFORMAT_STRING_SPECIFIER(wchar_t, wxFormatString::Arg_Char | wxFormatString::Arg_Int)
 #endif
 
+#if !wxUSE_UNICODE
+wxFORMAT_STRING_SPECIFIER(char, wxFormatString::Arg_Char | wxFormatString::Arg_Int)
+wxFORMAT_STRING_SPECIFIER(signed char, wxFormatString::Arg_Char | wxFormatString::Arg_Int)
+wxFORMAT_STRING_SPECIFIER(unsigned char, wxFormatString::Arg_Char | wxFormatString::Arg_Int)
+#endif
+
 wxFORMAT_STRING_SPECIFIER(char*, wxFormatString::Arg_String | wxFormatString::Arg_Pointer)
 wxFORMAT_STRING_SPECIFIER(unsigned char*, wxFormatString::Arg_String | wxFormatString::Arg_Pointer)
 wxFORMAT_STRING_SPECIFIER(signed char*, wxFormatString::Arg_String | wxFormatString::Arg_Pointer)