1 files changed, 3 insertions, 3 deletions
diff --git a/src/MainWindow.cpp b/src/MainWindow.cpp
index 83fda6d..5305a28 100644
--- a/src/MainWindow.cpp
+++ b/src/MainWindow.cpp
@@ -17,7 +17,7 @@ wxDEFINE_EVENT(CLOSE_LINKED_TAB, wxCommandEvent);
 MainWindow::MainWindow()
     : MainFrame(NULL, wxID_ANY, "OChess: The Open Chess software",
                 wxDefaultPosition, wxSize(1500, 1000)),
-      prefsEditor(NULL) {
+      prefsEditor(nullptr) {
   SetStatusText("OChess");
 
   /// File menu
@@ -196,7 +196,7 @@ void MainWindow::NewEngine() {
 }
 
 void MainWindow::OpenSettings() {
-  if (prefsEditor != NULL) {
+  if (prefsEditor != nullptr) {
     delete prefsEditor;
   }
   prefsEditor = new wxPreferencesEditor("Preferences");
@@ -213,7 +213,7 @@ void MainWindow::ApplyPreferences() {
 }
 
 void MainWindow::OnClose(wxCloseEvent &e) {
-  if (prefsEditor != NULL) {
+  if (prefsEditor != nullptr) {
     prefsEditor->Dismiss();
   }
   e.Skip();