diff --git a/lib/EAPBase/include/EAP.h b/lib/EAPBase/include/EAP.h
index 1622e6f..30959a4 100644
--- a/lib/EAPBase/include/EAP.h
+++ b/lib/EAPBase/include/EAP.h
@@ -633,6 +633,7 @@ namespace eap
     enum diameter_avp_flags_t : unsigned char {
         diameter_avp_flag_vendor    = 0x80, ///< Vendor-ID present
         diameter_avp_flag_mandatory = 0x40, ///< Mandatory
+        diameter_avp_flag_privacy   = 0x20, ///< Privacy Required
     };