diff --git a/src/gtk/radiobox.cpp b/src/gtk/radiobox.cpp
index a2f712302d..11d58c16d1 100644
--- a/src/gtk/radiobox.cpp
+++ b/src/gtk/radiobox.cpp
@@ -756,9 +756,12 @@ wxVisualAttributes
 wxRadioBox::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 {
     wxVisualAttributes attr;
+    // NB: we need toplevel window so that GTK+ can find the right style
+    GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     GtkWidget* widget = gtk_radio_button_new_with_label(NULL, "");
+    gtk_container_add(GTK_CONTAINER(wnd), widget);
     attr = GetDefaultAttributesFromGTKWidget(widget);
-    gtk_widget_destroy(widget);
+    gtk_widget_destroy(wnd);
     return attr;
 }
 
diff --git a/src/gtk/radiobut.cpp b/src/gtk/radiobut.cpp
index 2c3e1c0d10..df0ad406d2 100644
--- a/src/gtk/radiobut.cpp
+++ b/src/gtk/radiobut.cpp
@@ -237,9 +237,12 @@ wxVisualAttributes
 wxRadioButton::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 {
     wxVisualAttributes attr;
+    // NB: we need toplevel window so that GTK+ can find the right style
+    GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     GtkWidget* widget = gtk_radio_button_new_with_label(NULL, "");
+    gtk_container_add(GTK_CONTAINER(wnd), widget);
     attr = GetDefaultAttributesFromGTKWidget(widget);
-    gtk_widget_destroy(widget);
+    gtk_widget_destroy(wnd);
     return attr;
 }
 
diff --git a/src/gtk1/radiobox.cpp b/src/gtk1/radiobox.cpp
index a2f712302d..11d58c16d1 100644
--- a/src/gtk1/radiobox.cpp
+++ b/src/gtk1/radiobox.cpp
@@ -756,9 +756,12 @@ wxVisualAttributes
 wxRadioBox::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 {
     wxVisualAttributes attr;
+    // NB: we need toplevel window so that GTK+ can find the right style
+    GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     GtkWidget* widget = gtk_radio_button_new_with_label(NULL, "");
+    gtk_container_add(GTK_CONTAINER(wnd), widget);
     attr = GetDefaultAttributesFromGTKWidget(widget);
-    gtk_widget_destroy(widget);
+    gtk_widget_destroy(wnd);
     return attr;
 }
 
diff --git a/src/gtk1/radiobut.cpp b/src/gtk1/radiobut.cpp
index 2c3e1c0d10..df0ad406d2 100644
--- a/src/gtk1/radiobut.cpp
+++ b/src/gtk1/radiobut.cpp
@@ -237,9 +237,12 @@ wxVisualAttributes
 wxRadioButton::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 {
     wxVisualAttributes attr;
+    // NB: we need toplevel window so that GTK+ can find the right style
+    GtkWidget *wnd = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     GtkWidget* widget = gtk_radio_button_new_with_label(NULL, "");
+    gtk_container_add(GTK_CONTAINER(wnd), widget);
     attr = GetDefaultAttributesFromGTKWidget(widget);
-    gtk_widget_destroy(widget);
+    gtk_widget_destroy(wnd);
     return attr;
 }