diff --git a/database/3.0.2_to_3.1.0.sql b/database/3.0.2_to_3.1.0.sql
index 443a60d05..e3a4fd5cf 100644
--- a/database/3.0.2_to_3.1.0.sql
+++ b/database/3.0.2_to_3.1.0.sql
@@ -404,3 +404,18 @@ ALTER TABLE ospos_suppliers CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_c
 ALTER TABLE ospos_tax_categories CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
 ALTER TABLE ospos_tax_code_rates CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
 ALTER TABLE ospos_tax_codes CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
+
+--
+-- Increase acceptable length of custom fields and allow null values
+--
+ALTER TABLE ospos_items
+MODIFY custom1 VARCHAR(255) DEFAULT NULL,
+MODIFY custom2 VARCHAR(255) DEFAULT NULL,
+MODIFY custom3 VARCHAR(255) DEFAULT NULL,
+MODIFY custom4 VARCHAR(255) DEFAULT NULL,
+MODIFY custom5 VARCHAR(255) DEFAULT NULL,
+MODIFY custom6 VARCHAR(255) DEFAULT NULL,
+MODIFY custom7 VARCHAR(255) DEFAULT NULL,
+MODIFY custom8 VARCHAR(255) DEFAULT NULL,
+MODIFY custom9 VARCHAR(255) DEFAULT NULL,
+MODIFY custom10 VARCHAR(255) DEFAULT NULL;