diff --git a/setup.cfg b/setup.cfg
index 4599d69e..5fbc5a99 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,6 +28,9 @@ include_package_data = True
 install_requires =
     trame-server>=3,<4
     trame-client>=3,<4
+    
+    # generic backend fixed for trame.tools.serve
+    wslink>=2.1.3 
 
 [semantic_release]
 version_pattern = setup.cfg:version = (\d+\.\d+\.\d+)
diff --git a/trame/tools/serve.py b/trame/tools/serve.py
index 56d92681..ba7261d8 100644
--- a/trame/tools/serve.py
+++ b/trame/tools/serve.py
@@ -56,7 +56,7 @@ async def on_msg_from_server(binary, content):
             async for msg in ws_network:
                 await connection.send(msg.type == aiohttp.WSMsgType.BINARY, msg)
         finally:
-            connection.close()
+            await connection.close()
             await app.server.stop()
             await task