diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md
index f7a71c9..b11c9bb 100644
--- a/book/en-us/03-runtime.md
+++ b/book/en-us/03-runtime.md
@@ -105,6 +105,8 @@ The type of the captured variable being declared is judged according to the expr
 and the judgment is the same as using `auto`:
 
 ```cpp
+#include <memory>
+
 void lambda_expression_capture() {
     auto important = std::make_unique<int>(1);
     auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int {
diff --git a/book/zh-cn/03-runtime.md b/book/zh-cn/03-runtime.md
index 2b8a76f..7752c9c 100644
--- a/book/zh-cn/03-runtime.md
+++ b/book/zh-cn/03-runtime.md
@@ -90,7 +90,8 @@ C++14 给与了我们方便，允许捕获的成员用任意的表达式进行
 
 ```cpp
 #include <iostream>
-#include <utility>
+#include <memory>  // std::make_unique
+#include <utility> // std::move
 
 int main() {
     auto important = std::make_unique<int>(1);
diff --git a/code/3/3.1.lambda.basic.cpp b/code/3/3.1.lambda.basic.cpp
index 085dadc..a0b8063 100644
--- a/code/3/3.1.lambda.basic.cpp
+++ b/code/3/3.1.lambda.basic.cpp
@@ -9,7 +9,8 @@
 
 
 #include <iostream>
-#include <utility>
+#include <memory>  // std::make_unique
+#include <utility> // std::move
 
 void lambda_value_capture() {
     int value = 1;