diff --git a/kingfisher_scrapy/extensions/database_store.py b/kingfisher_scrapy/extensions/database_store.py
index 392491f0..3dad37c3 100644
--- a/kingfisher_scrapy/extensions/database_store.py
+++ b/kingfisher_scrapy/extensions/database_store.py
@@ -1,4 +1,3 @@
-import csv
 import os
 import warnings
 from datetime import datetime
@@ -119,17 +118,15 @@ def spider_closed(self, spider, reason):
                 convert_exceptions_to_warnings=True,
             )
 
-        filename = os.path.join(crawl_directory, 'data.csv')
-        spider.logger.info('Writing the JSON data to the %s CSV file', filename)
+        filename = os.path.join(crawl_directory, 'data.jsonl')
+        spider.logger.info('Writing the JSON data to the %s JSONL file', filename)
         count = 0
         with open(filename, 'w') as f:
-            writer = csv.writer(f)
-
             with warnings.catch_warnings(record=True) as wlist:
-                warnings.simplefilter("always", category=MergeErrorWarning)
+                warnings.simplefilter('always', category=MergeErrorWarning)
 
                 for item in data:
-                    writer.writerow([util.json_dumps(item, ensure_ascii=False).replace(r'\u0000', '')])
+                    f.write(util.json_dumps(item, ensure_ascii=False).replace(r'\u0000', '') + '\n')
                     count += 1
 
             errors = []
@@ -149,9 +146,12 @@ def spider_closed(self, spider, reason):
             self.execute('DROP TABLE {table}', table=table_name)
             self.create_table(table_name)
             with open(filename) as f:
-                self.cursor.copy_expert(self.format('COPY {table}(data) FROM STDIN WITH CSV', table=table_name), f)
-            self.execute("CREATE INDEX {index} ON {table}(cast(data->>'date' as text))", table=table_name,
-                         index=f'idx_{table_name}')
+                self.cursor.copy_expert(self.format('COPY {table} (data) FROM stdin', table=table_name), f)
+            self.execute(
+                "CREATE INDEX {index} ON {table} (cast(data->>'date' as text))",
+                table=table_name,
+                index=f'idx_{table_name}',
+            )
             self.connection.commit()
         finally:
             self.cursor.close()
diff --git a/tests/extensions/test_database_store.py b/tests/extensions/test_database_store.py
index da6fc895..d7f09c01 100644
--- a/tests/extensions/test_database_store.py
+++ b/tests/extensions/test_database_store.py
@@ -168,7 +168,7 @@ def test_spider_closed_warnings(cursor, caplog, tmpdir):
     assert [record.message for record in caplog.records] == [
         f'Reading the {tmpdir}/test/20210525_000000 crawl directory with the empty prefix',
         'Creating generator of compiled releases',
-        f'Writing the JSON data to the {tmpdir}/test/20210525_000000/data.csv CSV file',
+        f'Writing the JSON data to the {tmpdir}/test/20210525_000000/data.jsonl JSONL file',
         'Replacing the JSON data in the test table (3 rows)',
     ]
 
@@ -245,7 +245,7 @@ def test_spider_closed(cursor, caplog, tmpdir, data, data_type, sample, compile_
 
     expected_messages = [
         f'Reading the {tmpdir}/test{suffix}/20210525_000000 crawl directory with the {prefix} prefix',
-        f'Writing the JSON data to the {tmpdir}/test{suffix}/20210525_000000/data.csv CSV file',
+        f'Writing the JSON data to the {tmpdir}/test{suffix}/20210525_000000/data.jsonl JSONL file',
         f'Replacing the JSON data in the {expected_table} table (1 rows)',
     ]