diff --git a/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/InverseDocumentFrequency.kt b/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/InverseDocumentFrequency.kt
index 6b73d94..1e71705 100644
--- a/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/InverseDocumentFrequency.kt
+++ b/libraries/tfidf/src/main/kotlin/de/itkl/tfidf/InverseDocumentFrequency.kt
@@ -29,15 +29,12 @@ class InverseDocumentFrequency : FileProcessor, KoinComponent {
             .find { (word, count) -> word == "\$numDocs" }!!
             .second.toInt()
         val progressBarFactory: ProgressBarFactory by inject()
-
-
-        var step: Long = 0;
         return progressBarFactory.new("compute idf", histogram.size.toLong()).use { progess ->
             csvWriter().openAsync(willProduce(resource.path).toFile(), append = false) {
                 writeRow("word", "idf")
                 histogram.forEach { (word, count) ->
                     writeRow(word, idf(numDocs, count))
-                    progess.update(step++)
+                    progess.step()
                 }
             }
             resource.path.toFile()