diff --git a/src/main/java/org/ids_mannheim/TotalNGram.java b/src/main/java/org/ids_mannheim/TotalNGram.java
index d09012b..2774da4 100644
--- a/src/main/java/org/ids_mannheim/TotalNGram.java
+++ b/src/main/java/org/ids_mannheim/TotalNGram.java
@@ -158,9 +158,9 @@
         System.err.println("Calculating column sums.");
         IntStream.rangeClosed(1, FOLDS)
                 .parallel()
-                .forEachOrdered(i -> output_stream.print("\t" + map.values()
-                        .parallelStream().mapToLong(e -> Integer.toUnsignedLong(e.count.get(i))).sum()));
-        output_stream.println("\t" + map.values().parallelStream().mapToLong(e -> Integer.toUnsignedLong(e.count.get(0))).sum());
+                .forEachOrdered(i -> output_stream.print("\t" + Long.toUnsignedString(map.values()
+                        .parallelStream().mapToLong(e -> Integer.toUnsignedLong(e.count.get(i))).sum())));
+        output_stream.println("\t" + Long.toUnsignedString(map.values().parallelStream().mapToLong(e -> Integer.toUnsignedLong(e.count.get(0))).sum()));
         output_stream.close();
         return null;
     }