diff --git a/kfet/static/kfet/js/kfet.js b/kfet/static/kfet/js/kfet.js
index e3e5a6d9..31758c36 100644
--- a/kfet/static/kfet/js/kfet.js
+++ b/kfet/static/kfet/js/kfet.js
@@ -39,7 +39,7 @@ function amountDisplay(amount, is_cof=false, tri='') {
 
 function amountToUKF(amount, is_cof=false) {
     var coef_cof = is_cof ? 1 + settings['subvention_cof'] / 100 : 1;
-    return Math.round(amount * coef_cof * 10);
+    return Math.floor(amount * coef_cof * 10);
 }
 
 function isValidTrigramme(trigramme) {
diff --git a/kfet/templatetags/kfet_tags.py b/kfet/templatetags/kfet_tags.py
index bb8bce9f..f27f590e 100644
--- a/kfet/templatetags/kfet_tags.py
+++ b/kfet/templatetags/kfet_tags.py
@@ -9,6 +9,7 @@ from django.utils.html import escape
 from django.utils.safestring import mark_safe
 from django.core.cache import cache
 from kfet.models import Settings
+from math import floor
 import re
 
 register = template.Library()
@@ -37,5 +38,4 @@ def highlight_clipper(clipper, q):
 @register.filter()
 def ukf(balance, is_cof):
     grant = is_cof and (1 + Settings.SUBVENTION_COF() / 100) or 1
-    # float nécessaire car sinon problème avec le round de future.builtins
-    return round(float(balance * 10 * grant))
+    return floor(balance * 10 * grant)