diff --git a/models/scop_cotisation.py b/models/scop_cotisation.py
index 20ebcebbf4a4ba4545ccd0f58e0cdebd84cb57c9..efe93dcea180588998774dcb29d0d87cb3e0d984 100644
--- a/models/scop_cotisation.py
+++ b/models/scop_cotisation.py
@@ -131,7 +131,8 @@ class ScopCotisation(models.AbstractModel):
         large_multiple = small_multiple + multiple
 
         # Return the closest of two
-        if abs(float_to_round - small_multiple) < large_multiple:
+        if abs(float_to_round - small_multiple) < \
+                abs(float_to_round - large_multiple):
             return small_multiple
         else:
             return large_multiple