diff --git a/phantom-monix/src/main/scala/com/outworkers/phantom/monix/execution/MonixPromiseInterface.scala b/phantom-monix/src/main/scala/com/outworkers/phantom/monix/execution/MonixPromiseInterface.scala
index 6e70fd569..98f01a03d 100644
--- a/phantom-monix/src/main/scala/com/outworkers/phantom/monix/execution/MonixPromiseInterface.scala
+++ b/phantom-monix/src/main/scala/com/outworkers/phantom/monix/execution/MonixPromiseInterface.scala
@@ -52,7 +52,9 @@ class MonixPromiseInterface extends PromiseInterface[Task, Task]{
         }
 
         Futures.addCallback(source, callback, executor.asInstanceOf[ExecutionContextExecutor])
-        Cancelable.empty
+        Cancelable { () =>
+          source.cancel(true)
+        }
       }
     }