diff --git a/mayan/apps/documents/serializers.py b/mayan/apps/documents/serializers.py
index 4dbc21a21f..6ca01dab70 100644
--- a/mayan/apps/documents/serializers.py
+++ b/mayan/apps/documents/serializers.py
@@ -161,6 +161,7 @@ class DocumentSerializer(serializers.HyperlinkedModelSerializer):
             'latest_version', 'url', 'uuid', 'versions',
         )
         model = Document
+        read_only_fields = ('document_type',)
 
 
 class NewDocumentSerializer(serializers.ModelSerializer):