diff --git a/communication_techniques/src/calculation/calc_useless_loop.c b/communication_techniques/src/calculation/calc_useless_loop.c
index a10257a..84865e8 100644
--- a/communication_techniques/src/calculation/calc_useless_loop.c
+++ b/communication_techniques/src/calculation/calc_useless_loop.c
@@ -4,6 +4,7 @@
 
 
 static int nb_loop = 0, prod = 0, *prod_ptr = ∏
+volatile int fourty_two = 42;
 unsigned int seedp;
 
 int init_calc(int param_nb_loop)
@@ -17,7 +18,7 @@ void **do_calc(void)
 	int i;
 
 	for(i = 0; i < nb_loop; i++)
-		prod += 42;
+		prod += fourty_two;
 	return (void **) &prod_ptr;
 }