From e37fa2b90ff4ef3b9332be6d96f3756970820fe8 Mon Sep 17 00:00:00 2001
From: Gareth Williams <gareth.williams.pypi@gmail.com>
Date: Fri, 5 Sep 2025 23:30:30 +0100
Subject: [PATCH] fix

---
 plotly/express/_core.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plotly/express/_core.py b/plotly/express/_core.py
index d2dbc84c0e..40d525dd40 100644
--- a/plotly/express/_core.py
+++ b/plotly/express/_core.py
@@ -2290,7 +2290,7 @@ def infer_config(args, constructor, trace_patch, layout_patch):
                 layout_patch[mode] = "group"
 
     if (
-        constructor == go.Histogram2d
+        constructor in [go.Histogram2d, go.Histogram2dContour]
         and args["z"] is not None
         and args["histfunc"] is None
     ):