diff --git a/data_structures/stack.h b/data_structures/stack.hpp
similarity index 96%
rename from data_structures/stack.h
rename to data_structures/stack.hpp
index ac190f1c3..d3b8cd7df 100644
--- a/data_structures/stack.h
+++ b/data_structures/stack.hpp
@@ -1,10 +1,10 @@
 /**
- * @file stack.h
+ * @file stack.hpp
  * @author danghai
  * @brief  This class specifies the basic operation on a stack as a linked list
  **/
-#ifndef DATA_STRUCTURES_STACK_H_
-#define DATA_STRUCTURES_STACK_H_
+#ifndef DATA_STRUCTURES_STACK_HPP_
+#define DATA_STRUCTURES_STACK_HPP_
 
 #include <cassert>
 #include <iostream>
@@ -153,4 +153,4 @@ class stack {
     int size;             ///< size of stack
 };
 
-#endif  // DATA_STRUCTURES_STACK_H_
+#endif  // DATA_STRUCTURES_STACK_HPP_
diff --git a/data_structures/test_stack.cpp b/data_structures/test_stack.cpp
index aa636916f..965dab017 100644
--- a/data_structures/test_stack.cpp
+++ b/data_structures/test_stack.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
 
-#include "./stack.h"
+#include "./stack.hpp"
 
 int main() {
     stack<int> stk;
diff --git a/data_structures/test_stack_students.cpp b/data_structures/test_stack_students.cpp
index a6048c4c9..b28055be3 100644
--- a/data_structures/test_stack_students.cpp
+++ b/data_structures/test_stack_students.cpp
@@ -14,7 +14,7 @@
 #include <iostream>
 #include <string>
 
-#include "./stack.h"
+#include "./stack.hpp"
 
 int main(int argc, char* argv[]) {
     double GPA;