diff --git a/00_pi.c b/00_pi.c
index 6ea47c1..6d2d1ab 100644
--- a/00_pi.c
+++ b/00_pi.c
@@ -8,7 +8,7 @@ int main(int argc, char *argv[]) {
         return 1;
     }
 
-    size_t tiros = atoi(argv[1]);
+    size_t tiros = atol(argv[1]);
 
     size_t positivos = 0;
 
diff --git a/01_pi_seed.c b/01_pi_seed.c
index 4b9aeb5..d458ea1 100644
--- a/01_pi_seed.c
+++ b/01_pi_seed.c
@@ -11,7 +11,7 @@ int main(int argc, char *argv[]) {
 
     srand(time(NULL));
 
-    size_t tiros = atoi(argv[1]);
+    size_t tiros = atol(argv[1]);
 
     size_t positivos = 0;
 
diff --git a/02_pi_openmp.c b/02_pi_openmp.c
index 093734e..7af23af 100644
--- a/02_pi_openmp.c
+++ b/02_pi_openmp.c
@@ -12,7 +12,7 @@ int main(int argc, char *argv[]) {
 
     printf("Hilos: %d\n", omp_get_max_threads());
 
-    size_t tiros = atoi(argv[1]);
+    size_t tiros = atol(argv[1]);
 
     size_t positivos = 0;