diff --git a/src/main/java/org/codejive/jpm/json/AppInfo.java b/src/main/java/org/codejive/jpm/json/AppInfo.java
index 9abdc17..070560b 100644
--- a/src/main/java/org/codejive/jpm/json/AppInfo.java
+++ b/src/main/java/org/codejive/jpm/json/AppInfo.java
@@ -16,7 +16,7 @@
  * from/to files.
  */
 public class AppInfo {
-    private Map<String, Object> json;
+    private Map<String, Object> json = new TreeMap<>();
     public Map<String, String> dependencies = new TreeMap<>();
 
     /** The official name of the app.json file. */