diff --git a/models/scop_cotisation_cg_exo.py b/models/scop_cotisation_cg_exo.py
index 82b77f5d98fe553e52c7d46cc84cd45b4818a5a4..3c75c4559129e3ca8c9ff89c9497c8d37e3bf4d7 100644
--- a/models/scop_cotisation_cg_exo.py
+++ b/models/scop_cotisation_cg_exo.py
@@ -479,7 +479,7 @@ class ScopCotisationExo(models.Model):
                 )
 
                 if self.type_exo == "percent":
-                    exo_amount = round(inv_amount * (1 - exo_line_id.percent / 100), 2)
+                    exo_amount = round(inv_amount * (exo_line_id.percent / 100), 2)
                 elif self.type_exo == "amount":
                     exo_amount = round(inv_amount - exo_line_id.amount, 2)
                 else: