diff --git a/src/gtk/app.cpp b/src/gtk/app.cpp
index 7aba0eab72..3754531c01 100644
--- a/src/gtk/app.cpp
+++ b/src/gtk/app.cpp
@@ -288,10 +288,6 @@ bool wxApp::Initialize(int& argc_, wxChar **argv_)
     if ( !wxAppBase::Initialize(argc_, argv_) )
         return false;
 
-    // disable Ubuntu "overlay scrollbar" until we figure out how to keep it
-    // from messing up our window contents when scrolling, see ticket #14871
-    wxSetEnv(wxS("LIBOVERLAY_SCROLLBAR"), wxS("0"));
-
 #if wxUSE_THREADS
     if (!g_thread_supported())
     {
diff --git a/src/gtk/dcclient.cpp b/src/gtk/dcclient.cpp
index 0ad9159ef5..4c4416ebe1 100644
--- a/src/gtk/dcclient.cpp
+++ b/src/gtk/dcclient.cpp
@@ -2103,7 +2103,10 @@ void wxClientDCImpl::DoGetSize(int *width, int *height) const
 {
     wxCHECK_RET( m_window, wxT("GetSize() doesn't work without window") );
 
-    m_window->GetClientSize( width, height );
+    if (m_window->m_wxwindow && m_gdkwindow)
+        gdk_drawable_get_size(m_gdkwindow, width, height);
+    else
+        m_window->GetClientSize(width, height);
 }
 
 //-----------------------------------------------------------------------------