diff --git a/app/comp/moy_ue.py b/app/comp/moy_ue.py
index 2d337a3d..df0e1a79 100644
--- a/app/comp/moy_ue.py
+++ b/app/comp/moy_ue.py
@@ -506,7 +506,8 @@ def compute_malus(
                 ]
             )
             if len(modimpl_mask):
-                malus_moys = sem_modimpl_moys[:, modimpl_mask].sum(axis=1)
+                # somme 1er composante du malus qui est scalaire
+                malus_moys = sem_modimpl_moys[:, modimpl_mask, 0].sum(axis=1)
                 malus[ue.id] = malus_moys
 
     malus.fillna(0.0, inplace=True)