diff --git a/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
index 35c0575..b1f1fe6 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/greater.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "pointer_comparison_test_helper.hpp"
+#include "pointer_comparison_test_helper.h"
 
 int main(int, char**)
 {
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
index 9a6d36c..30cf7e0 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/greater_equal.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "pointer_comparison_test_helper.hpp"
+#include "pointer_comparison_test_helper.h"
 
 int main(int, char**)
 {
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
index 31a2f97..88b7c78 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "pointer_comparison_test_helper.hpp"
+#include "pointer_comparison_test_helper.h"
 
 int main(int, char**)
 {
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp b/libcxx/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
index 31cbed1..5aa6d79 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/less_equal.pass.cpp
@@ -15,7 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
-#include "pointer_comparison_test_helper.hpp"
+#include "pointer_comparison_test_helper.h"
 
 int main(int, char**)
 {
diff --git a/libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.hpp b/libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.h
similarity index 89%
rename from libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.hpp
rename to libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.h
index b23d4e8..ac4df55 100644
--- a/libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.hpp
+++ b/libcxx/test/std/utilities/function.objects/comparisons/pointer_comparison_test_helper.h
@@ -1,5 +1,5 @@
-#ifndef POINTER_COMPARISON_TEST_HELPER_HPP
-#define POINTER_COMPARISON_TEST_HELPER_HPP
+#ifndef POINTER_COMPARISON_TEST_HELPER_H
+#define POINTER_COMPARISON_TEST_HELPER_H
 
 #include <vector>
 #include <memory>
@@ -36,4 +36,4 @@
     }
 }
 
-#endif // POINTER_COMPARISON_TEST_HELPER_HPP
+#endif // POINTER_COMPARISON_TEST_HELPER_H