diff --git a/lib/cmds/blockchain/geth_commands.js b/lib/cmds/blockchain/geth_commands.js
index 21a8a2d7..ab71fda8 100644
--- a/lib/cmds/blockchain/geth_commands.js
+++ b/lib/cmds/blockchain/geth_commands.js
@@ -46,9 +46,9 @@ class GethCommands {
   determineNetworkType(config) {
     let cmd;
     if (config.networkType === 'testnet') {
-      cmd = "--testnet ";
+      cmd = "--testnet";
     } else if (config.networkType === 'olympic') {
-      cmd = "--olympic ";
+      cmd = "--olympic";
     } else if (config.networkType === 'custom') {
       cmd = "--networkid=" + config.networkId;
     }