diff --git a/tests/unittest.cpp b/tests/unittest.cpp
index c99fe5d7f..7da485c90 100644
--- a/tests/unittest.cpp
+++ b/tests/unittest.cpp
@@ -3929,8 +3929,8 @@ TEST_CASE("task_timer")
         b = true;
     });
 
-    asio::steady_timer t(io_service);
-    asio::error_code ec;
+    asio::steady_timer t(io_context);
+    asio_error_code ec;
 
     t.expires_from_now(3 * timer.get_tick_length());
     t.wait(ec);