diff --git a/oio-unix.c b/oio-unix.c
index e1277d83..422e75ac 100644
--- a/oio-unix.c
+++ b/oio-unix.c
@@ -903,3 +903,14 @@ int oio_idle_start(oio_handle_t* handle, oio_loop_cb cb) {
 int oio_idle_stop(oio_handle_t* handle) {
   assert(0 && "implement me");
 }
+
+
+int oio_async_init(oio_handle_t* handle, oio_async_cb async_cb,
+    oio_close_cb close_cb, void* data) {
+  assert(0 && "implement me");
+}
+
+
+int oio_async_send(oio_handle_t* handle) {
+  assert(0 && "implement me");
+}
diff --git a/test/runner-unix.c b/test/runner-unix.c
index c4d6d72a..ebabbfad 100644
--- a/test/runner-unix.c
+++ b/test/runner-unix.c
@@ -22,6 +22,8 @@
 #include "runner-unix.h"
 #include "runner.h"
 
+#include <stdint.h> /* uintptr_t */
+
 #include <unistd.h>
 #include <string.h> /* strdup */
 #include <stdio.h>
@@ -301,3 +303,22 @@ void process_cleanup(process_info_t *p) {
 void rewind_cursor() {
   fprintf(stderr, "\033[2K\r");
 }
+
+
+uintptr_t oio_create_thread(void (*entry)(void* arg), void* arg) {
+  assert(0 && "implement me");
+}
+
+
+/* Wait for a thread to terminate. Should return 0 if the thread ended, -1 on
+ * error.
+ */
+int oio_wait_thread(uintptr_t thread_id) {
+  assert(0 && "implement me");
+}
+
+
+/* Pause the calling thread for a number of milliseconds. */
+void oio_sleep(int msec) {
+  assert(0 && "implement me");
+}