diff --git a/src/ripple_app/ledger/SerializedValidation.cpp b/src/ripple_app/ledger/SerializedValidation.cpp
index 69f309b84..e0ecaab55 100644
--- a/src/ripple_app/ledger/SerializedValidation.cpp
+++ b/src/ripple_app/ledger/SerializedValidation.cpp
@@ -63,6 +63,7 @@ void SerializedValidation::sign (uint256& signingHash, const RippleAddress& raPr
     Blob signature;
     raPriv.signNodePrivate (signingHash, signature);
     setFieldVL (sfSignature, signature);
+    setFlag (vfFullyCanonicalSig);
 }
 
 uint256 SerializedValidation::getSigningHash () const
diff --git a/src/ripple_app/rpc/RPCHandler.cpp b/src/ripple_app/rpc/RPCHandler.cpp
index da4c9b98b..8737ff121 100644
--- a/src/ripple_app/rpc/RPCHandler.cpp
+++ b/src/ripple_app/rpc/RPCHandler.cpp
@@ -338,7 +338,7 @@ Json::Value RPCHandler::transactionSign (Json::Value params,
         }
     }
 
-    if (!tx_json.isMember ("Flags")) tx_json["Flags"] = 0;
+    if (!tx_json.isMember ("Flags")) tx_json["Flags"] = tfFullyCanonicalSig;
 
     if (!bOffline)
     {