diff --git a/rhodecode/__init__.py b/rhodecode/__init__.py
--- a/rhodecode/__init__.py
+++ b/rhodecode/__init__.py
@@ -45,7 +45,7 @@ PYRAMID_SETTINGS = {}
 EXTENSIONS = {}
 
 __version__ = ('.'.join((str(each) for each in VERSION[:3])))
-__dbversion__ = 101  # defines current db version for migrations
+__dbversion__ = 102  # defines current db version for migrations
 __platform__ = platform.system()
 __license__ = 'AGPLv3, and Commercial License'
 __author__ = 'RhodeCode GmbH'
diff --git a/rhodecode/lib/dbmigrate/versions/102_version_4_18_0.py b/rhodecode/lib/dbmigrate/versions/102_version_4_18_0.py
new file mode 100644
--- /dev/null
+++ b/rhodecode/lib/dbmigrate/versions/102_version_4_18_0.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+
+import logging
+from sqlalchemy import *
+
+from alembic.migration import MigrationContext
+from alembic.operations import Operations
+from sqlalchemy import BigInteger
+
+from rhodecode.lib.dbmigrate.versions import _reset_base
+from rhodecode.model import init_model_encryption
+
+
+log = logging.getLogger(__name__)
+
+
+def upgrade(migrate_engine):
+    """
+    Upgrade operations go here.
+    Don't create your own engine; bind migrate_engine to your metadata
+    """
+    _reset_base(migrate_engine)
+    from rhodecode.lib.dbmigrate.schema import db_4_18_0_1
+
+    init_model_encryption(db_4_18_0_1)
+
+    context = MigrationContext.configure(migrate_engine.connect())
+    op = Operations(context)
+
+    file_store = db_4_18_0_1.FileStore.__table__
+
+    with op.batch_alter_table(file_store.name) as batch_op:
+        batch_op.alter_column("file_size", type_=BigInteger())
+
+
+def downgrade(migrate_engine):
+    meta = MetaData()
+    meta.bind = migrate_engine
+
+
+def fixups(models, _SESSION):
+    pass
diff --git a/rhodecode/model/db.py b/rhodecode/model/db.py
--- a/rhodecode/model/db.py
+++ b/rhodecode/model/db.py
@@ -40,7 +40,7 @@ from sqlalchemy import (
     or_, and_, not_, func, TypeDecorator, event,
     Index, Sequence, UniqueConstraint, ForeignKey, CheckConstraint, Column,
     Boolean, String, Unicode, UnicodeText, DateTime, Integer, LargeBinary,
-    Text, Float, PickleType)
+    Text, Float, PickleType, BigInteger)
 from sqlalchemy.sql.expression import true, false, case
 from sqlalchemy.sql.functions import coalesce, count  # pragma: no cover
 from sqlalchemy.orm import (
@@ -5131,7 +5131,7 @@ class FileStore(Base, BaseModel):
 
     # sha256 hash
     file_hash = Column('file_hash', String(512), nullable=False)
-    file_size = Column('file_size', Integer(), nullable=False)
+    file_size = Column('file_size', BigInteger(), nullable=False)
 
     created_on = Column('created_on', DateTime(timezone=False), nullable=False, default=datetime.datetime.now)
     accessed_on = Column('accessed_on', DateTime(timezone=False), nullable=True)