diff --git a/ch01/ex1_10.cpp b/ch01/ex1_10.cpp
index 28e0f9c7..7f1bca79 100644
--- a/ch01/ex1_10.cpp
+++ b/ch01/ex1_10.cpp
@@ -2,12 +2,14 @@
 
 #include <iostream>
 
+using namespace std;
+
 int main()
 {
     int val = 10;
     while (val >= 0) {
-        std::cout << val << std::endl;
-        --val;
+        cout << val << endl;
+        --val; 
     }
 
     return 0;