diff --git a/src/cpp/ripple/ripple_Main.cpp b/src/cpp/ripple/ripple_Main.cpp
index 23b2f619c..3cd923825 100644
--- a/src/cpp/ripple/ripple_Main.cpp
+++ b/src/cpp/ripple/ripple_Main.cpp
@@ -58,8 +58,8 @@ void printHelp (const po::options_description& desc)
     cerr << desc << endl;
 
     cerr << "Options: " << endl;
-    cerr << "     -rpc-ip=<ip-address>[':'<port-number>]" << endl;
-    cerr << "     -rpc-port=<port-number>" << endl;
+    cerr << "     -rpc_ip=<ip-address>[':'<port-number>]" << endl;
+    cerr << "     -rpc_port=<port-number>" << endl;
     cerr << endl;
     cerr << "Commands: " << endl;
     cerr << "     account_info <account>|<nickname>|<seed>|<pass_phrase>|<key> [<ledger>] [strict]" << endl;