diff --git a/bigchaindb/backend/mongodb/schema.py b/bigchaindb/backend/mongodb/schema.py
index 00616dcb..01eac29c 100644
--- a/bigchaindb/backend/mongodb/schema.py
+++ b/bigchaindb/backend/mongodb/schema.py
@@ -52,8 +52,7 @@ def create_bigchain_secondary_index(conn, dbname):
 
     # secondary index on block id which is should be unique
     conn.conn[dbname]['bigchain'].create_index('id',
-                                               name='block_id',
-                                               unique=True)
+                                               name='block_id')
 
     # to order blocks by timestamp
     conn.conn[dbname]['bigchain'].create_index([('block.timestamp',
diff --git a/tests/backend/mongodb/test_schema.py b/tests/backend/mongodb/test_schema.py
index e11dbfe8..1a244b1b 100644
--- a/tests/backend/mongodb/test_schema.py
+++ b/tests/backend/mongodb/test_schema.py
@@ -22,8 +22,8 @@ def test_init_creates_db_tables_and_indexes():
                                         'votes']
 
     indexes = conn.conn[dbname]['bigchain'].index_information().keys()
-    assert sorted(indexes) == ['_id_', 'asset_id', 'block_timestamp', 'inputs',
-                               'outputs', 'transaction_id']
+    assert sorted(indexes) == ['_id_', 'asset_id', 'block_id', 'block_timestamp',
+                               'inputs', 'outputs', 'transaction_id']
 
     indexes = conn.conn[dbname]['backlog'].index_information().keys()
     assert sorted(indexes) == ['_id_', 'assignee__transaction_timestamp',
@@ -86,8 +86,8 @@ def test_create_secondary_indexes():
 
     # Bigchain table
     indexes = conn.conn[dbname]['bigchain'].index_information().keys()
-    assert sorted(indexes) == ['_id_', 'asset_id', 'block_timestamp', 'inputs',
-                               'outputs', 'transaction_id']
+    assert sorted(indexes) == ['_id_', 'asset_id', 'block_id', 'block_timestamp',
+                               'inputs', 'outputs', 'transaction_id']
 
     # Backlog table
     indexes = conn.conn[dbname]['backlog'].index_information().keys()