diff --git a/modules/ripple_data/protocol/ripple_LedgerFormat.h b/modules/ripple_data/protocol/ripple_LedgerFormat.h
index f6cf7e07f..eb8e0f4a8 100644
--- a/modules/ripple_data/protocol/ripple_LedgerFormat.h
+++ b/modules/ripple_data/protocol/ripple_LedgerFormat.h
@@ -84,6 +84,7 @@ enum LedgerSpecificFlags
     lsfRequireDestTag   = 0x00020000,   // True, to require a DestinationTag for payments.
     lsfRequireAuth      = 0x00040000,   // True, to require a authorization to hold IOUs.
     lsfDisallowXRP      = 0x00080000,   // True, to disallow sending XRP.
+    lsfDisableMaster	= 0x00100000,	// True, force regular key
 
     // ltOFFER
     lsfPassive          = 0x00010000,
diff --git a/modules/ripple_data/protocol/ripple_TxFlags.h b/modules/ripple_data/protocol/ripple_TxFlags.h
index 5a8fee220..ca4338443 100644
--- a/modules/ripple_data/protocol/ripple_TxFlags.h
+++ b/modules/ripple_data/protocol/ripple_TxFlags.h
@@ -33,9 +33,12 @@ const uint32 tfRequireAuth          = 0x00040000;
 const uint32 tfOptionalAuth         = 0x00080000;
 const uint32 tfDisallowXRP          = 0x00100000;
 const uint32 tfAllowXRP             = 0x00200000;
+const uint32 tfDisableMaster        = 0x00400000;
+const uint32 tfEnableMaster         = 0x00800000;
 const uint32 tfAccountSetMask       = ~ (TxFlag::requireDestTag | tfOptionalDestTag
                                       | tfRequireAuth | tfOptionalAuth
-                                      | tfDisallowXRP | tfAllowXRP);
+                                      | tfDisallowXRP | tfAllowXRP
+                                      | tfDisableMaster | tfEnableMaster);
 
 // OfferCreate flags:
 const uint32 tfPassive              = 0x00010000;