diff --git a/src/createnewdialog.cpp b/src/createnewdialog.cpp
index 8dea4945..825c8334 100644
--- a/src/createnewdialog.cpp
+++ b/src/createnewdialog.cpp
@@ -9,7 +9,7 @@ createNewDialog::createNewDialog(QWidget *parent) :
     ui(new Ui::createNewDialog)
 {
     ui->setupUi(this);
-    w = new MainWindow(this);
+    w = new MainWindow(nullptr);
     w->core = new QRCore ();
 }
 
@@ -22,7 +22,7 @@ void createNewDialog::on_pushButton_2_clicked()
 {
     // Close dialog and open OptionsDialog
     close();
-    NewFileDialog* n = new NewFileDialog(this);
+    NewFileDialog* n = new NewFileDialog(nullptr);
     n->show();
 }
 
diff --git a/src/newfiledialog.cpp b/src/newfiledialog.cpp
index be42702f..4f9f667f 100644
--- a/src/newfiledialog.cpp
+++ b/src/newfiledialog.cpp
@@ -100,7 +100,7 @@ void NewFileDialog::on_loadFileButton_clicked()
     } else {
         // Close dialog and open OptionsDialog
         close();
-        OptionsDialog* o = new OptionsDialog(this);
+        OptionsDialog* o = new OptionsDialog(nullptr);
         o->setFilename (fname, this->strippedName(fname));
         o->exec();
     }
@@ -145,7 +145,7 @@ void NewFileDialog::on_recentsList_itemDoubleClicked(QListWidgetItem *item)
     QString sitem = data.toString();
     // Close dialog and open OptionsDialog
     close();
-    OptionsDialog* o = new OptionsDialog(this);
+    OptionsDialog* o = new OptionsDialog(nullptr);
     o->setFilename (sitem, this->strippedName(sitem));
     o->exec();
 }
@@ -177,7 +177,7 @@ void NewFileDialog::on_createButton_clicked()
 {
     // Close dialog and open create new file dialog
     close();
-    createNewDialog* n = new createNewDialog(this);
+    createNewDialog* n = new createNewDialog(nullptr);
     n->exec();
 }
 
diff --git a/src/optionsdialog.cpp b/src/optionsdialog.cpp
index 3b32f028..2d1d00f9 100644
--- a/src/optionsdialog.cpp
+++ b/src/optionsdialog.cpp
@@ -73,7 +73,7 @@ void OptionsDialog::on_okButton_clicked()
     //ui->progressBar->setValue(5);
 
     // Close dialog and open OptionsDialog
-    this->w = new MainWindow(this);
+    this->w = new MainWindow(nullptr);
     this->w->core = this->core;
 
     // Fill asm plugins in hexdump combo
@@ -234,7 +234,7 @@ void OptionsDialog::on_cancelButton_clicked()
     this->core = NULL; // implicit by delete?
     // Close dialog and open OptionsDialog
     close();
-    NewFileDialog* n = new NewFileDialog(this);
+    NewFileDialog* n = new NewFileDialog(nullptr);
     n->show();
 }