diff --git a/ch03/ex3_18.cpp b/ch03/ex3_18.cpp
index 703123c0..39d1eb65 100644
--- a/ch03/ex3_18.cpp
+++ b/ch03/ex3_18.cpp
@@ -1,10 +1,7 @@
 #include <vector>
 
-using std::vector;
-
 int main()
 {
-  vector<int> ivec{0};
-  ivec[0] = 42;
-  return 0;
+    std::vector<int> ivec{ 42 };
+    return 0;
 }