diff --git a/uhepp_org/uhepp_api/uhepp.schema.json b/uhepp_org/uhepp_api/uhepp.schema.json
index ce4c5f4e8740e2803bc13db98298f9a44d4fb70c..e0550bba75678cab01773c31f5e9d44f93f3056e 100644
--- a/uhepp_org/uhepp_api/uhepp.schema.json
+++ b/uhepp_org/uhepp_api/uhepp.schema.json
@@ -178,7 +178,7 @@
         "rebin": {"$ref": "#/definitions/edges"},
         "include_underflow": {"type": "boolean"},
         "include_overflow": {"type": "boolean"},
-        "density_width": {"type": "boolean"}
+        "density_width": {"type": ["number", "null"]}
       },
       "required": ["edges"],
       "additionalProperties": false