diff --git a/tests/alignment.cpp b/tests/alignment.cpp
index ffb91d5..8b1ce8c 100644
--- a/tests/alignment.cpp
+++ b/tests/alignment.cpp
@@ -1,4 +1,4 @@
-//===-- alignment.cc --------------------------------------------*- C++ -*-===//
+//===-- alignment.cpp -------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
diff --git a/tests/backtrace.cpp b/tests/backtrace.cpp
index 9ed16a5..6dccdb8 100644
--- a/tests/backtrace.cpp
+++ b/tests/backtrace.cpp
@@ -1,4 +1,4 @@
-//===-- backtrace.cc --------------------------------------------*- C++ -*-===//
+//===-- backtrace.cpp -------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
diff --git a/tests/basic.cpp b/tests/basic.cpp
index 9c80e27..663db91 100644
--- a/tests/basic.cpp
+++ b/tests/basic.cpp
@@ -1,4 +1,4 @@
-//===-- basic.cc ------------------------------------------------*- C++ -*-===//
+//===-- basic.cpp -----------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
diff --git a/tests/slot_reuse.cpp b/tests/slot_reuse.cpp
index e243739..ee4b671 100644
--- a/tests/slot_reuse.cpp
+++ b/tests/slot_reuse.cpp
@@ -1,4 +1,4 @@
-//===-- slot_reuse.cc -------------------------------------------*- C++ -*-===//
+//===-- slot_reuse.cpp ------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
diff --git a/tests/thread_contention.cpp b/tests/thread_contention.cpp
index 1c00f44..33b5748 100644
--- a/tests/thread_contention.cpp
+++ b/tests/thread_contention.cpp
@@ -1,4 +1,4 @@
-//===-- thread_contention.cc ------------------------------------*- C++ -*-===//
+//===-- thread_contention.cpp -----------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.