diff --git a/akka-stream-tests/src/test/scala/akka/stream/impl/fusing/InterpreterSpec.scala b/akka-stream-tests/src/test/scala/akka/stream/impl/fusing/InterpreterSpec.scala
index ef92c42119..8855f0f43b 100644
--- a/akka-stream-tests/src/test/scala/akka/stream/impl/fusing/InterpreterSpec.scala
+++ b/akka-stream-tests/src/test/scala/akka/stream/impl/fusing/InterpreterSpec.scala
@@ -550,6 +550,8 @@ class InterpreterSpec extends AkkaSpec with GraphInterpreterSpecKit {
 
     }
 
+    //#20386
+    @deprecated("Usage of PushPullStage is deprecated, please use GraphStage instead", "2.4.5")
     class InvalidAbsorbTermination extends PushPullStage[Int, Int] {
       override def onPull(ctx: Context[Int]): SyncDirective = ctx.pull()
       override def onPush(elem: Int, ctx: Context[Int]): SyncDirective = ctx.push(elem)