diff --git a/Sieve_of_Eratosthenes.cpp b/Sieve_of_Eratosthenes.cpp
index 14b30cf..e3808f9 100644
--- a/Sieve_of_Eratosthenes.cpp
+++ b/Sieve_of_Eratosthenes.cpp
@@ -1,4 +1,4 @@
-#include <iostream>
+#include <bits/stdc++.h>
 
 using namespace std;
 
diff --git a/prime_no_factorization.cpp b/prime_no_factorization.cpp
index a05f82d..a739e24 100644
--- a/prime_no_factorization.cpp
+++ b/prime_no_factorization.cpp
@@ -1,4 +1,4 @@
-#include <iostream>
+#include <bits/stdc++.h>
 
 using namespace std;