diff --git a/htdocs/install/mysql/tables/llx_opensurvey_user_studs.key.sql b/htdocs/install/mysql/tables/llx_opensurvey_user_studs.key.sql
index 041b2d0593d..810080e3466 100755
--- a/htdocs/install/mysql/tables/llx_opensurvey_user_studs.key.sql
+++ b/htdocs/install/mysql/tables/llx_opensurvey_user_studs.key.sql
@@ -15,6 +15,6 @@
 -- along with this program. If not, see <http://www.gnu.org/licenses/>.
 -- ============================================================================
 
-ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_id_users (id_users);
-ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_nom (nom);
-ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_id_sondage (id_sondage);
+ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_opensurvey_user_studs_id_users (id_users);
+ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_opensurvey_user_studs_nom (nom);
+ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_opensurvey_user_studs_id_sondage (id_sondage);