diff --git a/config/cert_exp_33.c b/config/cert_exp_33.c
index 0a87e075b0e1e9ebf743df38d27e609795b16f7a..f314e565789accfde351046319ad9528fa3e60a9 100644
--- a/config/cert_exp_33.c
+++ b/config/cert_exp_33.c
@@ -10,6 +10,9 @@ void set_flag(int number, int *sign_flag) {
   } else if (number < 0) {
     *sign_flag = -1;
   }
+  else {
+  	*sign_flag = 0; // gère le cas où number est 0
+  	}
   Frama_C_show_each_set_flag(number, *sign_flag);
 }