diff --git a/src/sources/mysql/sql/list-table-rows.sql b/src/sources/mysql/sql/list-table-rows.sql
index 82f58c8..9509e49 100644
--- a/src/sources/mysql/sql/list-table-rows.sql
+++ b/src/sources/mysql/sql/list-table-rows.sql
@@ -4,7 +4,7 @@
 --         excluding
 --         filter-list-to-where-clause excluding
     SELECT table_name,
-           cast(data_length/avg_row_length as integer)
+           coalesce(cast(data_length/avg_row_length as unsigned), 0)
       FROM information_schema.tables
     WHERE     table_schema = '~a'
           and table_type = 'BASE TABLE'