diff --git a/src/main/scala/com/snowplowanalytics/s3/loader/connector/KinesisS3Emitter.scala b/src/main/scala/com/snowplowanalytics/s3/loader/connector/KinesisS3Emitter.scala
index 59c98ce..17dbb73 100644
--- a/src/main/scala/com/snowplowanalytics/s3/loader/connector/KinesisS3Emitter.scala
+++ b/src/main/scala/com/snowplowanalytics/s3/loader/connector/KinesisS3Emitter.scala
@@ -111,13 +111,11 @@ class KinesisS3Emitter(client: AmazonS3,
    * @param bucket where data will be written
    * @param stream stream of rows with filename
    * @param now connection attempt start time
-   * @param callback a procedure to execute after successful emit, e.g. reporting
    * @return success status of sending to S3
    */
   def attemptEmit(
     stream: ISerializer.NamedStream,
-    now: Long,
-    callback: () => Unit
+    now: Long
   ): Unit = {
     def logAndSleep(attempt: Int, e: Throwable): Unit = {
       logger.error(
@@ -138,7 +136,7 @@ class KinesisS3Emitter(client: AmazonS3,
       else {
         val request = getRequest(output.s3.bucketName, stream, now)
         Either.catchNonFatal(client.putObject(request)) match {
-          case Right(_) => callback()
+          case Right(_) => ()
           case Left(error) =>
             logAndSleep(attempt, error)
             go(attempt + 1)
@@ -177,8 +175,9 @@ class KinesisS3Emitter(client: AmazonS3,
 
     if (successSize > 0)
       serializationResults.namedStreams.foreach { stream =>
-        attemptEmit(stream, System.currentTimeMillis(), callback)
+        attemptEmit(stream, System.currentTimeMillis())
       }
+    callback()
 
     failures
   }