diff --git a/crash_handler.cpp b/crash_handler.cpp
index 3c64025..b9baace 100644
--- a/crash_handler.cpp
+++ b/crash_handler.cpp
@@ -1,4 +1,4 @@
-//===-- crash_handler_interface.cpp -----------------------------*- C++ -*-===//
+//===-- crash_handler.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/crash_handler.h b/crash_handler.h
index 631c319..4a95069 100644
--- a/crash_handler.h
+++ b/crash_handler.h
@@ -1,4 +1,4 @@
-//===-- crash_handler_interface.h -------------------------------*- C++ -*-===//
+//===-- crash_handler.h -----------------------------------------*- 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/definitions.h b/definitions.h
index 563c408..bec0290 100644
--- a/definitions.h
+++ b/definitions.h
@@ -1,4 +1,4 @@
-//===-- gwp_asan_definitions.h ----------------------------------*- C++ -*-===//
+//===-- definitions.h -------------------------------------------*- 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/guarded_pool_allocator.h b/guarded_pool_allocator.h
index ae00506..12049e1 100644
--- a/guarded_pool_allocator.h
+++ b/guarded_pool_allocator.h
@@ -37,7 +37,7 @@
   // GWP-ASan. The constructor value-initialises the class such that if no
   // further initialisation takes place, calls to shouldSample() and
   // pointerIsMine() will return false.
-  constexpr GuardedPoolAllocator(){};
+  constexpr GuardedPoolAllocator() {}
   GuardedPoolAllocator(const GuardedPoolAllocator &) = delete;
   GuardedPoolAllocator &operator=(const GuardedPoolAllocator &) = delete;
 
diff --git a/optional/segv_handler.h b/optional/segv_handler.h
index 0fed4f2..e1d96a6 100644
--- a/optional/segv_handler.h
+++ b/optional/segv_handler.h
@@ -1,4 +1,4 @@
-//===-- crash_handler.h -----------------------------------------*- C++ -*-===//
+//===-- segv_handler.h ------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef GWP_ASAN_OPTIONAL_CRASH_HANDLER_H_
-#define GWP_ASAN_OPTIONAL_CRASH_HANDLER_H_
+#ifndef GWP_ASAN_OPTIONAL_SEGV_HANDLER_H_
+#define GWP_ASAN_OPTIONAL_SEGV_HANDLER_H_
 
 #include "gwp_asan/guarded_pool_allocator.h"
 #include "gwp_asan/options.h"
@@ -87,4 +87,4 @@
 } // namespace crash_handler
 } // namespace gwp_asan
 
-#endif // GWP_ASAN_OPTIONAL_CRASH_HANDLER_H_
+#endif // GWP_ASAN_OPTIONAL_SEGV_HANDLER_H_
diff --git a/optional/segv_handler_posix.cpp b/optional/segv_handler_posix.cpp
index 9a80436..8d9f39a 100644
--- a/optional/segv_handler_posix.cpp
+++ b/optional/segv_handler_posix.cpp
@@ -1,4 +1,4 @@
-//===-- crash_handler_posix.cpp ---------------------------------*- C++ -*-===//
+//===-- segv_handler_posix.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/platform_specific/common_posix.cpp b/platform_specific/common_posix.cpp
index e44e629..813882a 100644
--- a/platform_specific/common_posix.cpp
+++ b/platform_specific/common_posix.cpp
@@ -1,4 +1,4 @@
-//===-- common_posix.cpp ---------------------------------*- C++ -*-===//
+//===-- common_posix.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/platform_specific/utilities_posix.cpp b/platform_specific/utilities_posix.cpp
index 0e60598..98f74e0 100644
--- a/platform_specific/utilities_posix.cpp
+++ b/platform_specific/utilities_posix.cpp
@@ -28,7 +28,7 @@
     android_set_abort_message(Message);
   abort();
 }
-#else  // __BIONIC__
+#else // __BIONIC__
 void Check(bool Condition, const char *Message) {
   if (Condition)
     return;
@@ -63,7 +63,7 @@
 #ifdef __BIONIC__
 static constexpr AlignmentStrategy PlatformDefaultAlignment =
     AlignmentStrategy::BIONIC;
-#else  // __BIONIC__
+#else // __BIONIC__
 static constexpr AlignmentStrategy PlatformDefaultAlignment =
     AlignmentStrategy::POWER_OF_TWO;
 #endif // __BIONIC__
diff --git a/random.cpp b/random.cpp
index 2180f92..927709a 100644
--- a/random.cpp
+++ b/random.cpp
@@ -18,9 +18,7 @@
 GWP_ASAN_TLS_INITIAL_EXEC uint32_t RandomState = 0xff82eb50;
 
 namespace gwp_asan {
-void initPRNG() {
-  RandomState = time(nullptr) + getThreadID();
-}
+void initPRNG() { RandomState = time(nullptr) + getThreadID(); }
 
 uint32_t getRandomUnsigned32() {
   RandomState ^= RandomState << 13;
diff --git a/utilities.h b/utilities.h
index 71d525f..8aeefe1 100644
--- a/utilities.h
+++ b/utilities.h
@@ -6,6 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifndef GWP_ASAN_UTILITIES_H_
+#define GWP_ASAN_UTILITIES_H_
+
 #include "gwp_asan/definitions.h"
 
 #include <stddef.h>
@@ -29,3 +32,5 @@
     size_t RealAllocationSize,
     AlignmentStrategy Align = AlignmentStrategy::DEFAULT);
 } // namespace gwp_asan
+
+#endif // GWP_ASAN_UTILITIES_H_