diff --git a/src/connection.c b/src/connection.c
index d37ad76d9..abe4fd66e 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -2437,3 +2437,14 @@ static int deallocate_mux_cleanup(void)
 	return 1;
 }
 REGISTER_PER_THREAD_FREE(deallocate_mux_cleanup);
+
+static void deinit_idle_conns(void)
+{
+	int i;
+
+	for (i = 0; i < global.nbthread; i++) {
+		if (idle_conns[i].cleanup_task)
+			task_destroy(idle_conns[i].cleanup_task);
+	}
+}
+REGISTER_POST_DEINIT(deinit_idle_conns);