diff --git a/docker-app/qfieldcloud/core/models.py b/docker-app/qfieldcloud/core/models.py
index a5eb0fd66..8e9dc474d 100644
--- a/docker-app/qfieldcloud/core/models.py
+++ b/docker-app/qfieldcloud/core/models.py
@@ -1067,7 +1067,7 @@ def clean(self) -> None:
 
 
 class Delta(models.Model):
-    class Method(Enum):
+    class Method(str, Enum):
         Create = "create"
         Delete = "delete"
         Patch = "patch"