diff --git a/utils/screenshotgen/src/guidesign.fbp b/utils/screenshotgen/src/guidesign.fbp
index 00e0a5b4f7..6cb2d47a4b 100644
--- a/utils/screenshotgen/src/guidesign.fbp
+++ b/utils/screenshotgen/src/guidesign.fbp
@@ -577,7 +577,7 @@
                                             <property name="permission">protected</property>
                                             <property name="pos"></property>
                                             <property name="size"></property>
-                                            <property name="style"></property>
+                                            <property name="style">wxRB_GROUP</property>
                                             <property name="subclass"></property>
                                             <property name="tooltip">wxRadioButton</property>
                                             <property name="value">1</property>
diff --git a/utils/screenshotgen/src/guiframe.cpp b/utils/screenshotgen/src/guiframe.cpp
index 5f1b4ddd0e..5244014005 100644
--- a/utils/screenshotgen/src/guiframe.cpp
+++ b/utils/screenshotgen/src/guiframe.cpp
@@ -116,7 +116,7 @@ GUIFrame::GUIFrame( wxWindow* parent, wxWindowID id, const wxString& title, cons
 	
 	fgSizer1->Add( m_checkBox2, 0, wxALL|wxALIGN_CENTER_VERTICAL|wxALIGN_CENTER_HORIZONTAL, 20 );
 	
-	m_radioBtn1 = new wxRadioButton( m_panel1, wxID_ANY, _("Checked"), wxDefaultPosition, wxDefaultSize, 0 );
+	m_radioBtn1 = new wxRadioButton( m_panel1, wxID_ANY, _("Checked"), wxDefaultPosition, wxDefaultSize, wxRB_GROUP );
 	m_radioBtn1->SetValue( true ); 
 	m_radioBtn1->SetToolTip( _("wxRadioButton") );
 	
diff --git a/utils/screenshotgen/src/screenshot_main.cpp b/utils/screenshotgen/src/screenshot_main.cpp
index a8697bdbae..02c3ef5375 100644
--- a/utils/screenshotgen/src/screenshot_main.cpp
+++ b/utils/screenshotgen/src/screenshot_main.cpp
@@ -77,12 +77,14 @@ ScreenshotFrame::~ScreenshotFrame()
     e.g. you cannot load a richtext file in a wxRichtextCtrl during initialization.
 
     Those customizations will be done here.
+
+
+    NB: under wxGTK for the radio button "unchecked" to be unchecked, it's
+        important to put the wxRB_GROUP style on the first wxRadioButton
+        (the one "checked") and no flags on the second one.
 */
 void ScreenshotFrame::InitFBControls()
 {
-    // explicitely uncheck radio button:
-    m_radioBtn2->SetValue(false);
-
     // For some reason, wxFormBuilder does not set the scrollbar range
     m_scrollBar1->SetScrollbar(50, 1, 100, 1);