diff --git a/htdocs/telephonie/script/graph-statistiques-clients.php b/htdocs/telephonie/script/graph-statistiques-clients.php
index 5a385802219..e0a1177b9c4 100644
--- a/htdocs/telephonie/script/graph-statistiques-clients.php
+++ b/htdocs/telephonie/script/graph-statistiques-clients.php
@@ -107,7 +107,7 @@ foreach ($clients as $client)
 
   if ($graphgain->total_cout > 0)
     {
-      $marge = ( ($graphgain->total_ca - $graphgain->total_cout) / $graphgain->total_cout * 100);
+      $marge = ( $graphgain->total_gain / $graphgain->total_cout * 100);
     }
 
   $sql = "INSERT INTO ".MAIN_DB_PREFIX."telephonie_client_stats (fk_client_comm, gain, ca, cout, marge)";