diff --git a/src/main/java/com/mesosphere/velocity/marathon/impl/MarathonBuilderImpl.java b/src/main/java/com/mesosphere/velocity/marathon/impl/MarathonBuilderImpl.java
index 37be5b9..8069b75 100644
--- a/src/main/java/com/mesosphere/velocity/marathon/impl/MarathonBuilderImpl.java
+++ b/src/main/java/com/mesosphere/velocity/marathon/impl/MarathonBuilderImpl.java
@@ -188,7 +188,7 @@ public MarathonBuilder toFile(final String filename) throws InterruptedException
         if (renderedFilepath.exists() && renderedFilepath.isDirectory())
             throw new MarathonFileInvalidException("File '" + realFilename + "' is a directory; not overwriting.");
 
-        renderedFilepath.write(json.toString(), null);
+        renderedFilepath.write(getApp().toString(), null);
         return this;
     }