diff --git a/akka-stream-tests/src/test/scala/akka/stream/scaladsl/FlowFlatMapPrefixSpec.scala b/akka-stream-tests/src/test/scala/akka/stream/scaladsl/FlowFlatMapPrefixSpec.scala
index cf7bfa9767..006c2e6734 100644
--- a/akka-stream-tests/src/test/scala/akka/stream/scaladsl/FlowFlatMapPrefixSpec.scala
+++ b/akka-stream-tests/src/test/scala/akka/stream/scaladsl/FlowFlatMapPrefixSpec.scala
@@ -423,7 +423,6 @@ class FlowFlatMapPrefixSpec extends StreamSpec("akka.loglevel = debug") {
           .withAttributes(attributes)
           .run()
 
-        notUsedF.value should be(empty)
         suffixF.value should be(empty)
         srcWatchTermF.value should be(empty)