diff --git a/lib/blockchain.js b/lib/blockchain.js
index 9ab5deaf..adf0f871 100644
--- a/lib/blockchain.js
+++ b/lib/blockchain.js
@@ -27,6 +27,10 @@ Blockchain.prototype.generate_basic_command = function() {
   cmd += "--networkid " + config.networkId + " ";
   cmd += "--rpccorsdomain \"" + config.rpcWhitelist + "\" ";
 
+  if(config.testnet !== void 0){
+    cmd += "--testnet "
+  }
+
   if (config.minerthreads !== void 0) {
     cmd += "--minerthreads \"" + config.minerthreads + "\" ";
   }