diff --git a/lib/robot.js b/lib/robot.js
index 222ec2b..17ebb58 100644
--- a/lib/robot.js
+++ b/lib/robot.js
@@ -398,7 +398,7 @@ Robot.prototype.startDevices = function(callback) {
 Robot.prototype.halt = function(callback) {
   callback = callback || function() {};
 
-  if (!this.isRunning) {
+  if (!this.running) {
     return callback();
   }
 
diff --git a/spec/lib/robot.spec.js b/spec/lib/robot.spec.js
index c5344be..7aca091 100644
--- a/spec/lib/robot.spec.js
+++ b/spec/lib/robot.spec.js
@@ -475,7 +475,7 @@ describe("Robot", function() {
         }
       });
 
-      bot.isRunning = true;
+      bot.running = true;
 
       device = bot.devices.ping;
       connection = bot.connections.loopback;