diff --git a/CHANGES.rst b/CHANGES.rst
index 731c83f0..5843e69a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,8 @@ Changelog
 5.1.18 (unreleased)
 -------------------
 
-- Nothing changed yet.
+- Fix sorting in @scadenziario-day endpoint.
+  [folix-01]
 
 
 5.1.17 (2024-11-25)
diff --git a/src/design/plone/contenttypes/restapi/services/scadenziario/post.py b/src/design/plone/contenttypes/restapi/services/scadenziario/post.py
index a310f0a2..ed09e5b4 100644
--- a/src/design/plone/contenttypes/restapi/services/scadenziario/post.py
+++ b/src/design/plone/contenttypes/restapi/services/scadenziario/post.py
@@ -185,8 +185,8 @@ def reply(self):
         if query is None:
             raise Exception("No query supplied")
 
-        if sort_order:
-            sort_order = "descending" if sort_order else "ascending"
+        if sort_order not in {"descending", "ascending"}:
+            sort_order = "ascending"
 
         # results = querybuilder(**querybuilder_parameters)
         # Seems that origina querybuilder is not able to handle event search on
@@ -265,7 +265,7 @@ def reply(self):
                             "category": brain.subject,
                         }
                     )
-                results_to_be_returned[key].sort(key=lambda x: x["title"])
+
         return {
             "@id": self.request.get("URL"),
             "items": results_to_be_returned,