diff --git a/pom.xml b/pom.xml
index 94999ca..42a6461 100644
--- a/pom.xml
+++ b/pom.xml
@@ -150,5 +150,11 @@
             <artifactId>picocli</artifactId>
             <version>4.2.0</version>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/org.anarres/parallelgzip -->
+        <dependency>
+            <groupId>org.anarres</groupId>
+            <artifactId>parallelgzip</artifactId>
+            <version>1.0.3</version>
+        </dependency>
     </dependencies>
 </project>
\ No newline at end of file
diff --git a/src/main/java/org/ids_mannheim/TotalNGram.java b/src/main/java/org/ids_mannheim/TotalNGram.java
index 44bd6e1..6e0add0 100644
--- a/src/main/java/org/ids_mannheim/TotalNGram.java
+++ b/src/main/java/org/ids_mannheim/TotalNGram.java
@@ -1,8 +1,10 @@
 package org.ids_mannheim;
 
+import org.anarres.parallelgzip.ParallelGZIPOutputStream;
 import picocli.CommandLine;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.PrintStream;
 import java.nio.file.AccessDeniedException;
 import java.nio.file.FileAlreadyExistsException;
@@ -89,6 +91,7 @@
         }
 
         PrintStream output_stream;
+        final PrintStream output_stream;
         if ((output_fillename == null) || output_fillename.equals("-")) {
             output_stream = System.out;
         } else {
@@ -104,7 +107,12 @@
                     System.exit(-1);
                 }
             }
-            output_stream = new PrintStream(f);
+            if (output_fillename.endsWith(".gz")) {
+                output_stream = new PrintStream(new ParallelGZIPOutputStream(new FileOutputStream(f)));
+            } else {
+                output_stream = new PrintStream(f);
+            }
+
         }
 
         FoldedEntry.setFolds(FOLDS);