diff --git a/src/design/plone/contenttypes/upgrades/to_7300.py b/src/design/plone/contenttypes/upgrades/to_7300.py
index d9531e4d..ba010d21 100644
--- a/src/design/plone/contenttypes/upgrades/to_7300.py
+++ b/src/design/plone/contenttypes/upgrades/to_7300.py
@@ -15,7 +15,7 @@ def to_7300(context):
             "pratica_associata": "file",
         },
         "Messaggio": {
-            "documenti _allegati": "file",
+            "documenti_allegati": "file",
         },
         "Persona": {
             "foto_persona": "image",