diff --git a/src/main/java/org/ids_mannheim/FoldedEntry.java b/src/main/java/org/ids_mannheim/FoldedEntry.java
index ee105c6..028561a 100644
--- a/src/main/java/org/ids_mannheim/FoldedEntry.java
+++ b/src/main/java/org/ids_mannheim/FoldedEntry.java
@@ -1,19 +1,19 @@
 package org.ids_mannheim;
 
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.atomic.AtomicLongArray;
+import java.util.concurrent.atomic.AtomicIntegerArray;
 import java.util.stream.IntStream;
 
 public class FoldedEntry implements Comparable<FoldedEntry> {
     static int FOLDS = 10;
-    final AtomicLongArray count;
+    final AtomicIntegerArray count;
 
     public static void setFolds(int folds) {
         FOLDS = folds;
     }
 
     public FoldedEntry() {
-        count = new AtomicLongArray(FOLDS + 1);
+        count = new AtomicIntegerArray(FOLDS + 1);
     }
 
     @Override
@@ -21,7 +21,7 @@
         if (foldedEntry == null) {
             return -1;
         } else {
-            return Long.compare(count.get(0), foldedEntry.count.get(0));
+            return Integer.compareUnsigned(count.get(0), foldedEntry.count.get(0));
         }
     }
 
@@ -39,7 +39,7 @@
     @Override
     public String toString() {
         StringBuilder b = new StringBuilder();
-        IntStream.rangeClosed(1, FOLDS).forEach(i -> b.append("\t").append(count.get(i)));
+        IntStream.rangeClosed(1, FOLDS).forEach(i -> b.append("\t").append(Integer.toUnsignedString(count.get(i))));
         b.append("\t").append(count.get(0));
         return b.toString();
     }
diff --git a/src/main/java/org/ids_mannheim/TotalNGram.java b/src/main/java/org/ids_mannheim/TotalNGram.java
index 3d4149c..47c4ec1 100644
--- a/src/main/java/org/ids_mannheim/TotalNGram.java
+++ b/src/main/java/org/ids_mannheim/TotalNGram.java
@@ -138,9 +138,10 @@
         logger.info("Calculating column sums.");
         System.err.println("Calculating column sums.");
         IntStream.rangeClosed(1, FOLDS)
-                .forEach(i -> output_stream.print("\t" + map.values()
-                        .parallelStream().mapToLong(e -> e.count.get(i)).sum()));
-        output_stream.println("\t" + map.values().parallelStream().mapToLong(e -> e.count.get(0)).sum());
+                .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());
         return null;
     }
 }