diff --git a/taiga/projects/serializers.py b/taiga/projects/serializers.py
index 553bee2c..5aa7c019 100644
--- a/taiga/projects/serializers.py
+++ b/taiga/projects/serializers.py
@@ -313,7 +313,7 @@ class ProjectSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.Project
-        read_only_fields = ("created_date", "modified_date", "owner")
+        read_only_fields = ("created_date", "modified_date", "owner", "slug")
         exclude = ("last_us_ref", "last_task_ref", "last_issue_ref",
                    "issues_csv_uuid", "tasks_csv_uuid", "userstories_csv_uuid")
 
@@ -383,7 +383,7 @@ class ProjectDetailSerializer(ProjectSerializer):
 class ProjectDetailAdminSerializer(ProjectDetailSerializer):
     class Meta:
         model = models.Project
-        read_only_fields = ("created_date", "modified_date", "owner")
+        read_only_fields = ("created_date", "modified_date", "owner", "slug")
         exclude = ("last_us_ref", "last_task_ref", "last_issue_ref")