diff --git a/lib/src/main/java/gdv/xport/util/JsonFormatter.java b/lib/src/main/java/gdv/xport/util/JsonFormatter.java
index 3f33b6a1..d10aa8b9 100644
--- a/lib/src/main/java/gdv/xport/util/JsonFormatter.java
+++ b/lib/src/main/java/gdv/xport/util/JsonFormatter.java
@@ -70,7 +70,7 @@ public JsonFormatter(final Writer writer) {
      */
     @Override
     public void write(final Datenpaket datenpaket) throws IOException {
-        String value = OBJECT_MAPPER.writeValueAsString(datenpaket);
+        String value = OBJECT_MAPPER.writerWithDefaultPrettyPrinter().writeValueAsString(datenpaket);
         this.write(value);
     }