diff --git a/include/class/acc_operation.class.php b/include/class/acc_operation.class.php
index 014404941..793fb7327 100644
--- a/include/class/acc_operation.class.php
+++ b/include/class/acc_operation.class.php
@@ -278,7 +278,7 @@ class Acc_Operation
         if ( $diff != 0 )
         {
 
-            printf (_("Erreur : balance incorrecte :diff = %d"),$diff);
+            printf (_("Erreur : balance incorrecte :diff = %s"),$diff);
             return false;
         }