diff --git a/library/kernel/json_object.e b/library/kernel/json_object.e
index 1e2ea2c8..8a13c64c 100644
--- a/library/kernel/json_object.e
+++ b/library/kernel/json_object.e
@@ -24,6 +24,8 @@ inherit
 
     TABLE_ITERABLE [JSON_VALUE, JSON_STRING]
 
+    DEBUG_OUTPUT
+
 create
     make