diff --git a/src/cpp/ripple/RPCErr.cpp b/src/cpp/ripple/RPCErr.cpp
index 9ab952080b..5d7e3e1632 100644
--- a/src/cpp/ripple/RPCErr.cpp
+++ b/src/cpp/ripple/RPCErr.cpp
@@ -21,6 +21,7 @@ Json::Value rpcError(int iError, Json::Value jvResult)
 		{ rpcBAD_BLOB,				"badBlob",			"Blob must be a non-empty hex string."					},
 		{ rpcBAD_SEED,				"badSeed",			"Disallowed seed."										},
 		{ rpcBAD_SYNTAX,			"badSyntax",		"Syntax error."											},
+		{ rpcCOMMAND_MISSING,		"commandMissing",	"Missing command entry."								},
 		{ rpcDST_ACT_MALFORMED,		"dstActMalformed",	"Destination account is malformed."						},
 		{ rpcDST_ACT_MISSING,		"dstActMissing",	"Destination account does not exists."					},
 		{ rpcDST_AMT_MALFORMED,		"dstAmtMalformed",	"Destination amount/currency/issuer is malformed."		},
diff --git a/src/cpp/ripple/RPCErr.h b/src/cpp/ripple/RPCErr.h
index fa62c0e625..0057c6af2f 100644
--- a/src/cpp/ripple/RPCErr.h
+++ b/src/cpp/ripple/RPCErr.h
@@ -45,6 +45,7 @@ enum {
 	rpcQUALITY_MALFORMED,
 	rpcBAD_BLOB,
 	rpcBAD_SEED,
+	rpcCOMMAND_MISSING,
 	rpcDST_ACT_MALFORMED,
 	rpcDST_ACT_MISSING,
 	rpcDST_AMT_MALFORMED,
diff --git a/src/cpp/ripple/RPCHandler.cpp b/src/cpp/ripple/RPCHandler.cpp
index 2948b52e2e..9f4efee100 100644
--- a/src/cpp/ripple/RPCHandler.cpp
+++ b/src/cpp/ripple/RPCHandler.cpp
@@ -2553,10 +2553,10 @@ Json::Value RPCHandler::doInternal(Json::Value jvRequest)
 	return RPCInternalHandler::runHandler(jvRequest["internal_command"].asString(), jvRequest["params"]);
 }
 
-Json::Value RPCHandler::doCommand(Json::Value& jvRequest, int iRole)
+Json::Value RPCHandler::doCommand(const Json::Value& jvRequest, int iRole)
 {
 	if (!jvRequest.isMember("command"))
-		return rpcError(rpcINVALID_PARAMS);
+		return rpcError(rpcCOMMAND_MISSING);
 
 	std::string		strCommand	= jvRequest["command"].asString();
 
diff --git a/src/cpp/ripple/RPCHandler.h b/src/cpp/ripple/RPCHandler.h
index 5c3365e014..3c79a73631 100644
--- a/src/cpp/ripple/RPCHandler.h
+++ b/src/cpp/ripple/RPCHandler.h
@@ -115,7 +115,7 @@ public:
 	RPCHandler(NetworkOPs* netOps);
 	RPCHandler(NetworkOPs* netOps, InfoSub* infoSub);
 
-	Json::Value doCommand(Json::Value& jvRequest, int role);
+	Json::Value doCommand(const Json::Value& jvRequest, int role);
 	Json::Value doRpcCommand(const std::string& strCommand, Json::Value& jvParams, int iRole);
 };