diff --git a/web/app/models.py b/web/app/models.py
index 757e5f40..fdade759 100644
--- a/web/app/models.py
+++ b/web/app/models.py
@@ -518,10 +518,10 @@ class Corpus(db.Model):
     user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
     # Fields
     creation_date = db.Column(db.DateTime(), default=datetime.utcnow)
-    current_nr_of_tokens = db.Column(db.BigInteger, default=0)
+    current_nr_of_tokens = db.Column(db.Integer, default=0)
     description = db.Column(db.String(255))
     last_edited_date = db.Column(db.DateTime(), default=datetime.utcnow)
-    max_nr_of_tokens = db.Column(db.BigInteger, default=2147483647)
+    max_nr_of_tokens = 2147483647
     status = db.Column(db.String(16), default='unprepared')
     title = db.Column(db.String(32))
     archive_file = db.Column(db.String(255))
diff --git a/web/migrations/versions/8b2e0d43384a_.py b/web/migrations/versions/8b2e0d43384a_.py
new file mode 100644
index 00000000..9cc64a13
--- /dev/null
+++ b/web/migrations/versions/8b2e0d43384a_.py
@@ -0,0 +1,28 @@
+"""empty message
+
+Revision ID: 8b2e0d43384a
+Revises: 790ce9512e75
+Create Date: 2021-01-25 11:18:45.256537
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '8b2e0d43384a'
+down_revision = '790ce9512e75'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('corpora', 'max_nr_of_tokens')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('corpora', sa.Column('max_nr_of_tokens', sa.INTEGER(), autoincrement=False, nullable=True))
+    # ### end Alembic commands ###