diff --git a/htdocs/install/mysql/tables/llx_c_shipment_mode.key.sql b/htdocs/install/mysql/tables/llx_c_shipment_mode.key.sql
index 15058c0630e..3a90d15330f 100644
--- a/htdocs/install/mysql/tables/llx_c_shipment_mode.key.sql
+++ b/htdocs/install/mysql/tables/llx_c_shipment_mode.key.sql
@@ -16,5 +16,5 @@
 --
 -- ===================================================================
 
-ALTER TABLE llx_c_shipment_mode ADD UNIQUE INDEX uk_c_shipment_mode (code);
+ALTER TABLE llx_c_shipment_mode ADD UNIQUE INDEX uk_c_shipment_mode (entity, code);