diff --git a/data/ddl/package/FORMULE_ARTOIS/body.sql b/data/ddl/package/FORMULE_ARTOIS/body.sql
index 13b7f7d658867ac74e8677f10967f11e87c41c7d..fa98fc87c25cb24364ba3e778df4b353ab8a8df0 100644
--- a/data/ddl/package/FORMULE_ARTOIS/body.sql
+++ b/data/ddl/package/FORMULE_ARTOIS/body.sql
@@ -282,7 +282,7 @@ CREATE OR REPLACE PACKAGE BODY FORMULE_ARTOIS AS
 
     -- AI=(AF20-AH20)/AD20
     WHEN c = 'AI' AND v >= 1 THEN
-      RETURN cell('AF',l) - cell('AH',l);
+      RETURN (cell('AF',l) - cell('AH',l)) / cell('AD', l);
 
 
 
@@ -384,4 +384,4 @@ CREATE OR REPLACE PACKAGE BODY FORMULE_ARTOIS AS
       ordre';
   END;
 
-END FORMULE_ARTOIS;
\ No newline at end of file
+END FORMULE_ARTOIS;