diff --git a/target_postgres/db_sync.py b/target_postgres/db_sync.py
index 4fba051..3bfcf2c 100644
--- a/target_postgres/db_sync.py
+++ b/target_postgres/db_sync.py
@@ -150,7 +150,7 @@ def record_to_csv_line(self, record):
         flatten = flatten_record(record)
         return ','.join(
             [
-                json.dumps(flatten[name]) if name in flatten and flatten[name] else ''
+                json.dumps(flatten[name]) if name in flatten and (flatten[name] == 0 or flatten[name]) else ''
                 for name in self.flatten_schema
             ]
         )