diff --git a/app/models/v_contact.rb b/app/models/v_contact.rb
index 5e8b8ba..5c99b91 100644
--- a/app/models/v_contact.rb
+++ b/app/models/v_contact.rb
@@ -37,7 +37,7 @@ class VContact < ApplicationRecord
       
       vc.last_volume_at = vc.volumes.select("datereception").first.datereception if vc.volumes.first
       
-      vc.prime = (vc.ac_rate / 100.0) * vc.cagnotte
+      vc.prime = (vc.ac_rate.to_f / 100.0) * vc.cagnotte
       
       vc.save
     end