diff --git a/dlls/sapi/async.c b/dlls/sapi/async.c
index 491ca657c1a..b02778ae7ba 100644
--- a/dlls/sapi/async.c
+++ b/dlls/sapi/async.c
@@ -171,8 +171,8 @@ HRESULT async_queue_task(struct async_queue *queue, struct async_task *task)
     return S_OK;
 }
 
-void async_wait_queue_empty(struct async_queue *queue, DWORD timeout)
+HRESULT async_wait_queue_empty(struct async_queue *queue, DWORD timeout)
 {
-    if (!queue->init) return;
-    WaitForSingleObject(queue->empty, timeout);
+    if (!queue->init) return WAIT_OBJECT_0;
+    return WaitForSingleObject(queue->empty, timeout);
 }
diff --git a/dlls/sapi/sapi_private.h b/dlls/sapi/sapi_private.h
index 94046926b2e..3cdb59b36a8 100644
--- a/dlls/sapi/sapi_private.h
+++ b/dlls/sapi/sapi_private.h
@@ -42,7 +42,7 @@ HRESULT async_start_queue(struct async_queue *queue);
 void async_empty_queue(struct async_queue *queue);
 void async_cancel_queue(struct async_queue *queue);
 HRESULT async_queue_task(struct async_queue *queue, struct async_task *task);
-void async_wait_queue_empty(struct async_queue *queue, DWORD timeout);
+HRESULT async_wait_queue_empty(struct async_queue *queue, DWORD timeout);
 
 HRESULT data_key_create( IUnknown *outer, REFIID iid, void **obj );
 HRESULT file_stream_create( IUnknown *outer, REFIID iid, void **obj );