diff --git a/qtfs/conn.c b/qtfs/conn.c
index dd96089c38406fd4cb4f60cd3f82e5618acfbc01..005f7fb8395fda924cba60ebbf1e45224100ce30 100644
--- a/qtfs/conn.c
+++ b/qtfs/conn.c
@@ -18,7 +18,7 @@ int log_level = LOG_ERROR;
 int qtfs_server_port = 12345;
 int qtfs_sock_max_conn = QTFS_MAX_THREADS;
 struct qtinfo *qtfs_diag_info = NULL;
-bool qtfs_epoll_mode = true; // true: support any mode; false: only support fifo
+bool qtfs_epoll_mode = false; // true: support any mode; false: only support fifo
 
 static atomic_t g_qtfs_conn_num;
 static struct list_head g_vld_lst;