diff --git a/communication_techniques/src/calculation/calc_useless_loop.c b/communication_techniques/src/calculation/calc_useless_loop.c
index adbf4ee..a10257a 100644
--- a/communication_techniques/src/calculation/calc_useless_loop.c
+++ b/communication_techniques/src/calculation/calc_useless_loop.c
@@ -1,14 +1,14 @@
 #include <stdlib.h>
-#include <stdio.h>
 #include <time.h>
+#include <unistd.h>
 
 
 static int nb_loop = 0, prod = 0, *prod_ptr = &prod;
+unsigned int seedp;
 
 int init_calc(int param_nb_loop)
 {
 	nb_loop = param_nb_loop;
-	srand((unsigned int) time(NULL));
 	return 0;
 }
 
@@ -17,7 +17,7 @@ void **do_calc(void)
 	int i;
 
 	for(i = 0; i < nb_loop; i++)
-		prod += rand();
+		prod += 42;
 	return (void **) &prod_ptr;
 }