diff --git a/migrations/versions/0042_default_stats_to_zero.py b/migrations/versions/0042_default_stats_to_zero.py
index 4b20a9805..4d862c903 100644
--- a/migrations/versions/0042_default_stats_to_zero.py
+++ b/migrations/versions/0042_default_stats_to_zero.py
@@ -1,14 +1,14 @@
 """empty message
 
 Revision ID: 0042_default_stats_to_zero
-Revises: 0040_add_reference
+Revises: 0041_platform_admin
 Create Date: 2016-03-17 11:09:17.906910
 
 """
 
 # revision identifiers, used by Alembic.
 revision = '0042_default_stats_to_zero'
-down_revision = '0040_add_reference'
+down_revision = '0041_platform_admin'
 
 from alembic import op
 import sqlalchemy as sa
@@ -33,11 +33,11 @@ def upgrade():
 def downgrade():
     ### commands auto generated by Alembic - please adjust! ###
     op.alter_column('notification_statistics', 'emails_requested', server_default=None)
-    op.alter_column('notification_statistics', 'emails_delivered', server_default=None)
-    op.alter_column('notification_statistics', 'emails_error', server_default=None)
+    op.alter_column('notification_statistics', 'emails_delivered', server_default=None, nullable=True)
+    op.alter_column('notification_statistics', 'emails_error', server_default=None, nullable=True)
     op.alter_column('notification_statistics', 'sms_requested', server_default=None)
-    op.alter_column('notification_statistics', 'sms_delivered', server_default=None)
-    op.alter_column('notification_statistics', 'sms_error', server_default=None)
+    op.alter_column('notification_statistics', 'sms_delivered', server_default=None, nullable=True)
+    op.alter_column('notification_statistics', 'sms_error', server_default=None, nullable=True)
     op.execute('update notification_statistics set emails_delivered = Null where emails_delivered = 0')
     op.execute('update notification_statistics set emails_error = Null where emails_error = 0')
     op.execute('update notification_statistics set sms_delivered = Null where sms_delivered = 0')