diff --git a/distrib/distrib.cc b/distrib/distrib.cc
index 1e1c0ef..b81bfc7 100644
--- a/distrib/distrib.cc
+++ b/distrib/distrib.cc
@@ -22,6 +22,7 @@ distrib::distrib()
     pthread_cond_init(&m_listen_cond, NULL);
     pthread_mutex_init(&m_listen_mutex, NULL);
     pthread_mutex_init(&m_task_mutex, NULL);
+    pthread_mutex_init(&m_tasks_in_progress_mutex, NULL);
     m_num_clients = 0;
     m_data = NULL;
     m_server = true;