diff --git a/bin/mm-decode-history-page.py b/bin/mm-decode-history-page.py
index 9fd02a0..f7a43e6 100755
--- a/bin/mm-decode-history-page.py
+++ b/bin/mm-decode-history-page.py
@@ -10,6 +10,8 @@
 # from datetime import datetime
 # from scapy.all import *
 import json
+import datetime
+json.JSONEncoder.default = lambda self,obj: (obj.isoformat() if isinstance(obj, datetime.datetime) else None)
 
 from decocare import lib, history, models