diff --git a/akka-projection-dynamodb/src/main/scala/akka/projection/dynamodb/internal/DynamoDBOffsetStore.scala b/akka-projection-dynamodb/src/main/scala/akka/projection/dynamodb/internal/DynamoDBOffsetStore.scala
index fc91051bd..5198ef49a 100644
--- a/akka-projection-dynamodb/src/main/scala/akka/projection/dynamodb/internal/DynamoDBOffsetStore.scala
+++ b/akka-projection-dynamodb/src/main/scala/akka/projection/dynamodb/internal/DynamoDBOffsetStore.scala
@@ -249,6 +249,7 @@ private[projection] class DynamoDBOffsetStore(
   }
 
   private def readTimestampOffset(): Future[TimestampOffsetBySlice] = {
+    implicit val sys = system   // for implicit stream materializer
     val oldState = state.get()
     // retrieve latest timestamp for each slice, and use the earliest
     val offsetBySliceFut =
@@ -263,7 +264,7 @@ private[projection] class DynamoDBOffsetStore(
         .mapConcat(identity)
         .runWith(Sink.fold(Map.empty[Int, TimestampOffset]) { (offsetMap, sliceAndOffset: (Int, TimestampOffset)) =>
           offsetMap + sliceAndOffset
-        })(matFromSystem(system))
+        })
 
     offsetBySliceFut.map { offsetBySlice =>
       val newState = State(offsetBySlice)