diff --git a/ui/qt/about_dialog.cpp b/ui/qt/about_dialog.cpp
index a1acfe5d7d..8715b73b61 100644
--- a/ui/qt/about_dialog.cpp
+++ b/ui/qt/about_dialog.cpp
@@ -116,7 +116,7 @@ const QString AboutDialog::plugins_scan()
 }
 
 AboutDialog::AboutDialog(QWidget *parent) :
-    QDialog(parent),
+    QDialog(NULL),
     ui(new Ui::AboutDialog)
 {
     ui->setupUi(this);
diff --git a/ui/qt/tcp_stream_dialog.cpp b/ui/qt/tcp_stream_dialog.cpp
index 85236d8a87..40e307aefa 100644
--- a/ui/qt/tcp_stream_dialog.cpp
+++ b/ui/qt/tcp_stream_dialog.cpp
@@ -81,7 +81,7 @@ const QString time_s_label_ = QObject::tr("Time (s)");
 const QString window_size_label_ = QObject::tr("Window Size (B)");
 
 TCPStreamDialog::TCPStreamDialog(QWidget *parent, capture_file *cf, tcp_graph_type graph_type) :
-    QDialog(parent),
+    QDialog(NULL, Qt::Window),
     ui(new Ui::TCPStreamDialog),
     cap_file_(cf),
     ts_origin_conn_(true),