diff --git a/src/sakia/main.py b/src/sakia/main.py
index 9ae7dd602a51555bbbcf207c0054b07347adc45e..65844f363335e26a36e549b38bc3f29c00c1f34a 100755
--- a/src/sakia/main.py
+++ b/src/sakia/main.py
@@ -10,6 +10,9 @@ import logging
 import os
 import traceback
 
+# To debug missing spec
+import jsonschema
+
 # To force cx_freeze import
 import PyQt5.QtSvg