diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1f283c6e141..4673caf3790 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 - Fix issue with creating dendrogram in subplots [[#4411](https://github.com/plotly/plotly.py/pull/4411)],
+- Fix issue with px.line not accepting "spline" line shape [[#2812](https://github.com/plotly/plotly.py/issues/2812)],
 
 ## [5.18.0] - 2023-10-25
 
diff --git a/packages/python/plotly/plotly/express/_core.py b/packages/python/plotly/plotly/express/_core.py
index 275efaf3b4a..5de16add69a 100644
--- a/packages/python/plotly/plotly/express/_core.py
+++ b/packages/python/plotly/plotly/express/_core.py
@@ -812,6 +812,7 @@ def make_trace_spec(args, constructor, attrs, trace_patch):
             or (
                 args["render_mode"] == "auto"
                 and len(args["data_frame"]) > 1000
+                and args.get("line_shape") != "spline"
                 and args["animation_frame"] is None
             )
         ):