diff --git a/atom/browser/api/atom_api_window.cc b/atom/browser/api/atom_api_window.cc
index 516d322b3a26..aa9c9cca683d 100644
--- a/atom/browser/api/atom_api_window.cc
+++ b/atom/browser/api/atom_api_window.cc
@@ -729,7 +729,8 @@ void Window::SetAspectRatio(double aspect_ratio, mate::Arguments* args) {
   window_->SetAspectRatio(aspect_ratio, extra_size);
 }
 
-void Window::PreviewFile(const std::string& filepath, const std::string& filename) {
+void Window::PreviewFile(const std::string& filepath,
+                         const std::string& filename) {
   window_->PreviewFile(filepath, filename);
 }
 
diff --git a/atom/browser/native_window.cc b/atom/browser/native_window.cc
index d01e6fbb2119..140dd1e3b6f8 100644
--- a/atom/browser/native_window.cc
+++ b/atom/browser/native_window.cc
@@ -374,7 +374,8 @@ void NativeWindow::SetAspectRatio(double aspect_ratio,
   aspect_ratio_extraSize_ = extra_size;
 }
 
-void NativeWindow::PreviewFile(const std::string& filepath, const std::string& filename) {
+void NativeWindow::PreviewFile(const std::string& filepath,
+                               const std::string& filename) {
 }
 
 void NativeWindow::RequestToClosePage() {
diff --git a/atom/browser/native_window.h b/atom/browser/native_window.h
index 9c4116a68bf5..e3b9fe563e7e 100644
--- a/atom/browser/native_window.h
+++ b/atom/browser/native_window.h
@@ -176,7 +176,8 @@ class NativeWindow : public base::SupportsUserData,
   double GetAspectRatio();
   gfx::Size GetAspectRatioExtraSize();
   virtual void SetAspectRatio(double aspect_ratio, const gfx::Size& extra_size);
-  virtual void PreviewFile(const std::string& filepath, const std::string& filename);
+  virtual void PreviewFile(const std::string& filepath,
+                           const std::string& filename);
 
   base::WeakPtr<NativeWindow> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();