diff --git a/src/gtk/radiobut.cpp b/src/gtk/radiobut.cpp
index d2c5f73cfe..49590debfb 100644
--- a/src/gtk/radiobut.cpp
+++ b/src/gtk/radiobut.cpp
@@ -123,6 +123,8 @@ void wxRadioButton::SetValue( bool val )
         // should give an assert
         // RL - No it shouldn't.  A wxGenericValidator might try to set it
         //      as FALSE.  Failing silently is probably TRTTD here.
+        // RR - MSW actually unchecks the radio button so do this here, too
+        gtk_toggle_button_set_active( GTK_TOGGLE_BUTTON(m_widget), FALSE );
     }
 
     g_signal_handlers_unblock_by_func(