diff --git a/locust/runners.py b/locust/runners.py
index 67bf831f30..699e0103c6 100644
--- a/locust/runners.py
+++ b/locust/runners.py
@@ -608,7 +608,7 @@ def heartbeat_worker(self):
                     logger.info("Worker %s failed to send heartbeat, setting state to missing." % str(client.id))
                     client.state = STATE_MISSING
                     client.user_count = 0
-                    if self.worker_count - len(self.clients.missing) <= 0:
+                    if self.worker_count <= 0:
                         logger.info("The last worker went missing, stopping test.")
                         self.stop()
                         self.check_stopped()