diff --git a/migrations/versions/0351_unique_key_annual_billing.py b/migrations/versions/0351_unique_key_annual_billing.py
index 2f814b815..288b18395 100644
--- a/migrations/versions/0351_unique_key_annual_billing.py
+++ b/migrations/versions/0351_unique_key_annual_billing.py
@@ -5,16 +5,28 @@ Revises: 0350_update_rates
 Create Date: 2021-04-12 09:02:45.098875
 
 """
+import os
+
 from alembic import op
 
 revision = '0351_unique_key_annual_billing'
 down_revision = '0350_update_rates'
 
+environment = os.environ['NOTIFY_ENVIRONMENT']
+
 
 def upgrade():
-    op.create_unique_constraint(
-        'uix_service_id_financial_year_start', 'annual_billing', ['service_id', 'financial_year_start']
-    )
+    index = """
+        CREATE UNIQUE INDEX CONCURRENTLY uix_service_id_financial_year_start 
+        ON annual_billing (service_id, financial_year_start)
+    """
+    constraint = """
+        ALTER TABLE annual_BILLING add constraint uix_service_id_financial_year_start
+         UNIQUE USING INDEX uix_service_id_financial_year_start
+    """
+    op.execute('COMMIT')
+    op.execute(index)
+    op.execute(constraint)
 
 
 def downgrade():