diff --git a/src/R3/Subject.cs b/src/R3/Subject.cs
index daae810d..e7fca955 100644
--- a/src/R3/Subject.cs
+++ b/src/R3/Subject.cs
@@ -143,6 +143,11 @@ public Subject()
         list = new FreeListCore<Subscription>(this); // use self as gate(reduce memory usage), this is slightly dangerous so don't lock this in user.
     }
 
+    public Subject(CancellationToken cancellationToken) : this()
+    {
+        this.RegisterTo(cancellationToken);
+    }
+
     public bool IsDisposed => completeState.IsDisposed;
 
     public void OnNext(T value)