diff --git a/htdocs/install/mysql/migration/2.7.0-2.8.0.sql b/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
index 1452490f934..dc7465061ff 100755
--- a/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
+++ b/htdocs/install/mysql/migration/2.7.0-2.8.0.sql
@@ -79,7 +79,7 @@ create table llx_extra_fields_options
   rank 					integer
 )type=innodb;
 
-ALTER TABLE llx_extra_fields_options ADD INDEX idx_extra_fields_options_fk_extra_fields (fk_extra_fields, entity);
+ALTER TABLE llx_extra_fields_options ADD INDEX idx_extra_fields_options_fk_extra_fields (fk_extra_fields);
 ALTER TABLE llx_extra_fields_options ADD CONSTRAINT fk_extra_fields_options_fk_extra_fields FOREIGN KEY (fk_extra_fields) REFERENCES llx_extra_fields (rowid);
 
 -- Create table of values
diff --git a/htdocs/install/mysql/tables/llx_extra_fields_options.key.sql b/htdocs/install/mysql/tables/llx_extra_fields_options.key.sql
index 4a09b63716c..5fadd148797 100644
--- a/htdocs/install/mysql/tables/llx_extra_fields_options.key.sql
+++ b/htdocs/install/mysql/tables/llx_extra_fields_options.key.sql
@@ -19,6 +19,6 @@
 -- ============================================================================
 
 
-ALTER TABLE llx_extra_fields_options ADD INDEX idx_extra_fields_options_fk_extra_fields (fk_extra_fields, entity);
+ALTER TABLE llx_extra_fields_options ADD INDEX idx_extra_fields_options_fk_extra_fields (fk_extra_fields);
 
 ALTER TABLE llx_extra_fields_options ADD CONSTRAINT fk_extra_fields_options_fk_extra_fields FOREIGN KEY (fk_extra_fields) REFERENCES llx_extra_fields (rowid);