diff --git a/app/models.py b/app/models.py
index 2ad66141..392bcc84 100644
--- a/app/models.py
+++ b/app/models.py
@@ -2022,8 +2022,8 @@ class AliasHibp(db.Model, ModelMixin):
 
     __table_args__ = (db.UniqueConstraint("alias_id", "hibp_id", name="uq_alias_hibp"),)
 
-    alias_id = db.Column(db.Integer(), db.ForeignKey("alias.id"))
-    hibp_id = db.Column(db.Integer(), db.ForeignKey("hibp.id"))
+    alias_id = db.Column(db.Integer(), db.ForeignKey("alias.id", ondelete="cascade"))
+    hibp_id = db.Column(db.Integer(), db.ForeignKey("hibp.id", ondelete="cascade"))
 
     alias = db.relationship(
         "Alias", backref=db.backref("alias_hibp", cascade="all, delete-orphan")
diff --git a/migrations/versions/2021_052518_68e2f38e33f4_.py b/migrations/versions/2021_052518_68e2f38e33f4_.py
new file mode 100644
index 00000000..9cfcbbb5
--- /dev/null
+++ b/migrations/versions/2021_052518_68e2f38e33f4_.py
@@ -0,0 +1,35 @@
+"""empty message
+
+Revision ID: 68e2f38e33f4
+Revises: 6cc7f073b358
+Create Date: 2021-05-25 18:13:07.614047
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '68e2f38e33f4'
+down_revision = '6cc7f073b358'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint('alias_hibp_hibp_id_fkey', 'alias_hibp', type_='foreignkey')
+    op.drop_constraint('alias_hibp_alias_id_fkey', 'alias_hibp', type_='foreignkey')
+    op.create_foreign_key(None, 'alias_hibp', 'alias', ['alias_id'], ['id'], ondelete='cascade')
+    op.create_foreign_key(None, 'alias_hibp', 'hibp', ['hibp_id'], ['id'], ondelete='cascade')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'alias_hibp', type_='foreignkey')
+    op.drop_constraint(None, 'alias_hibp', type_='foreignkey')
+    op.create_foreign_key('alias_hibp_alias_id_fkey', 'alias_hibp', 'alias', ['alias_id'], ['id'])
+    op.create_foreign_key('alias_hibp_hibp_id_fkey', 'alias_hibp', 'hibp', ['hibp_id'], ['id'])
+    # ### end Alembic commands ###