diff --git a/WSPRBandHopping.cpp b/WSPRBandHopping.cpp
index 4eaf02ca0..8fa3a96d8 100644
--- a/WSPRBandHopping.cpp
+++ b/WSPRBandHopping.cpp
@@ -68,7 +68,7 @@ private:
 
 Dialog::Dialog (QSettings * settings, Configuration const * configuration, BandList const * WSPR_bands
                 , QBitArray * bands, int * gray_line_duration, QWidget * parent)
-  : QDialog {parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint}
+  : QDialog {parent, Qt::Window | Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowMinimizeButtonHint}
   , settings_ {settings}
   , configuration_ {configuration}
   , WSPR_bands_ {WSPR_bands}
diff --git a/astro.cpp b/astro.cpp
index 9f5bbba5f..c461524c0 100644
--- a/astro.cpp
+++ b/astro.cpp
@@ -21,7 +21,7 @@
 #include "moc_astro.cpp"
 
 Astro::Astro(QSettings * settings, Configuration const * configuration, QWidget * parent)
-  : QWidget {parent, Qt::Dialog | Qt::WindowCloseButtonHint | Qt::WindowMinimizeButtonHint}
+  : QWidget {parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowMinimizeButtonHint | Qt::MSWindowsFixedSizeDialogHint}
   , settings_ {settings}
   , configuration_ {configuration}
   , ui_ {new Ui::Astro}
diff --git a/echograph.cpp b/echograph.cpp
index a4179cabd..6e81f5d6c 100644
--- a/echograph.cpp
+++ b/echograph.cpp
@@ -8,16 +8,15 @@
 #define NSMAX2 1366
 
 EchoGraph::EchoGraph(QSettings * settings, QWidget *parent) :
-  QDialog(parent),
+  QDialog {parent, Qt::Window | Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowMinimizeButtonHint},
   m_settings (settings),
   ui(new Ui::EchoGraph)
 {
   ui->setupUi(this);
-  this->setWindowFlags(Qt::Dialog);
-  this->installEventFilter(parent);                   //Installing the filter
+  installEventFilter(parent);                   //Installing the filter
   ui->echoPlot->setCursor(Qt::CrossCursor);
-  this->setMaximumWidth(2048);
-  this->setMaximumHeight(880);
+  setMaximumWidth(2048);
+  setMaximumHeight(880);
   ui->echoPlot->setMaximumHeight(800);
 
 //Restore user's settings