diff --git a/rdmo/projects/serializers/v1/__init__.py b/rdmo/projects/serializers/v1/__init__.py
index 192f20aed..26ea38402 100644
--- a/rdmo/projects/serializers/v1/__init__.py
+++ b/rdmo/projects/serializers/v1/__init__.py
@@ -65,7 +65,7 @@ def get_queryset(self):
 
     last_changed = serializers.DateTimeField(read_only=True)
 
-    visibility = serializers.CharField(source='visibility.get_help_display')
+    visibility = serializers.CharField(source='visibility.get_help_display', read_only=True)
 
     class Meta:
         model = Project