diff --git a/htdocs/install/mysql/tables/llx_product_attribute_combination_price_level.key.sql b/htdocs/install/mysql/tables/llx_product_attribute_combination_price_level.key.sql
index 4c191193754..f13f1ed9d86 100644
--- a/htdocs/install/mysql/tables/llx_product_attribute_combination_price_level.key.sql
+++ b/htdocs/install/mysql/tables/llx_product_attribute_combination_price_level.key.sql
@@ -17,5 +17,5 @@
 -- ============================================================================
 
 
-ALTER TABLE llx_product_attribute_combination_price_level ADD UNIQUE( fk_product_attribute_combination, fk_price_level);
+ALTER TABLE llx_product_attribute_combination_price_level ADD UNIQUE INDEX uk_prod_att_comb_price_level(fk_product_attribute_combination, fk_price_level);