diff --git a/src/TouchSocket.SerialPorts/Components/SerialPortClientBase.cs b/src/TouchSocket.SerialPorts/Components/SerialPortClientBase.cs
index 326095821..1ce9da887 100644
--- a/src/TouchSocket.SerialPorts/Components/SerialPortClientBase.cs
+++ b/src/TouchSocket.SerialPorts/Components/SerialPortClientBase.cs
@@ -230,7 +230,7 @@ public abstract class SerialPortClientBase : SetupConfigObject, ISerialPortSessi
     #region Connect
 
     /// <inheritdoc/>
-    public async Task ConnectAsync(int millisecondsTimeout, CancellationToken token)
+    public virtual async Task ConnectAsync(int millisecondsTimeout, CancellationToken token)
     {
         this.ThrowIfDisposed();
         this.ThrowIfConfigIsNull();