diff --git a/caravel/migrations/versions/4e6a06bad7a8_init.py b/caravel/migrations/versions/4e6a06bad7a8_init.py
index 9c8e2529af..d448aa79c6 100644
--- a/caravel/migrations/versions/4e6a06bad7a8_init.py
+++ b/caravel/migrations/versions/4e6a06bad7a8_init.py
@@ -58,7 +58,7 @@ def upgrade():
     sa.Column('created_on', sa.DateTime(), nullable=False),
     sa.Column('changed_on', sa.DateTime(), nullable=False),
     sa.Column('id', sa.Integer(), nullable=False),
-    sa.Column('datasource_name', sa.String(length=250), nullable=True),
+    sa.Column('datasource_name', sa.String(length=256), nullable=True),
     sa.Column('is_featured', sa.Boolean(), nullable=True),
     sa.Column('is_hidden', sa.Boolean(), nullable=True),
     sa.Column('description', sa.Text(), nullable=True),
diff --git a/caravel/models.py b/caravel/models.py
index 1e572ed926..29d3ca35a9 100644
--- a/caravel/models.py
+++ b/caravel/models.py
@@ -849,7 +849,7 @@ class DruidDatasource(Model, AuditMixinNullable, Queryable):
 
     __tablename__ = 'datasources'
     id = Column(Integer, primary_key=True)
-    datasource_name = Column(String(250), unique=True)
+    datasource_name = Column(String(256), unique=True)
     is_featured = Column(Boolean, default=False)
     is_hidden = Column(Boolean, default=False)
     description = Column(Text)