diff --git a/atom/browser/api/atom_api_power_monitor.h b/atom/browser/api/atom_api_power_monitor.h
index ada2b8332bc5..b574e7cf1f4b 100644
--- a/atom/browser/api/atom_api_power_monitor.h
+++ b/atom/browser/api/atom_api_power_monitor.h
@@ -28,6 +28,7 @@ class PowerMonitor : public mate::EventEmitter,
   virtual void OnSuspend() OVERRIDE;
   virtual void OnResume() OVERRIDE;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(PowerMonitor);
 };
 
diff --git a/atom/common/browser_v8_locker.h b/atom/common/browser_v8_locker.h
index 4e508e2556bc..b87a830f547c 100644
--- a/atom/common/browser_v8_locker.h
+++ b/atom/common/browser_v8_locker.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ATOM_COMMON_LOCKED_HANDLE_SCOPE_H_
-#define ATOM_COMMON_LOCKED_HANDLE_SCOPE_H_
+#ifndef ATOM_COMMON_BROWSER_V8_LOCKER_H_
+#define ATOM_COMMON_BROWSER_V8_LOCKER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "v8/include/v8.h"
@@ -13,7 +13,7 @@ namespace atom {
 // Like v8::Locker, but only do lock when in browser process.
 class BrowserV8Locker {
  public:
-  BrowserV8Locker(v8::Isolate* isolate);
+  explicit BrowserV8Locker(v8::Isolate* isolate);
   ~BrowserV8Locker();
 
  private:
@@ -25,4 +25,4 @@ class BrowserV8Locker {
 
 }  // namespace atom
 
-#endif  // ATOM_COMMON_LOCKED_HANDLE_SCOPE_H_
+#endif  // ATOM_COMMON_BROWSER_V8_LOCKER_H_