diff --git a/admin/freeposte/admin/models.py b/admin/freeposte/admin/models.py
index 07c3e5b6..b9b18f68 100644
--- a/admin/freeposte/admin/models.py
+++ b/admin/freeposte/admin/models.py
@@ -189,7 +189,7 @@ class Alias(Email):
     """
     domain = db.relationship(Domain,
         backref=db.backref('aliases', cascade='all, delete-orphan'))
-    wildcard = db.Column(db.Boolean(), default=False)
+    wildcard = db.Column(db.Boolean(), nullable=False, default=False)
     destination = db.Column(CommaSeparatedList, nullable=False, default=[])
 
 
diff --git a/admin/migrations/versions/c5696b48442d_.py b/admin/migrations/versions/c5696b48442d_.py
index 1ca05aff..a613a267 100644
--- a/admin/migrations/versions/c5696b48442d_.py
+++ b/admin/migrations/versions/c5696b48442d_.py
@@ -15,7 +15,7 @@ import sqlalchemy as sa
 
 
 def upgrade():
-    op.add_column('alias', sa.Column('wildcard', sa.Boolean(), nullable=True))
+    op.add_column('alias', sa.Column('wildcard', sa.Boolean(), nullable=False, default=False))
 
 
 def downgrade():