diff --git a/hiboo/models.py b/hiboo/models.py
index 9592d02ca9f635634902706525a285d78b23ff2d..ca8cd2d546f1885055734096b4872d7e9adb8412 100644
--- a/hiboo/models.py
+++ b/hiboo/models.py
@@ -231,7 +231,7 @@ class Service(db.Model):
     description = db.Column(db.String())
     policy = db.Column(db.String(255))
     max_profiles = db.Column(db.Integer(), nullable=False, default=1)
-    profile_format = db.Column(db.String(255))
+    profile_format = db.Column(db.String(255), nullable=False, default='lowercase')
     single_profile = db.Column(db.Boolean(), nullable=False, default=False)
     config = db.Column(mutable.MutableDict.as_mutable(JSONEncoded))