--- a/widget/gtk2/nsWindow.cpp
+++ b/widget/gtk2/nsWindow.cpp
@@ -90,16 +90,17 @@ using namespace mozilla::widget;
 #include <gdk/gdk.h>
 #include <wchar.h>
 #include "imgIContainer.h"
 #include "nsGfxCIID.h"
 #include "nsImageToPixbuf.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsAutoPtr.h"
 #include "BasicLayers.h"
+#include "ClientLayerManager.h"
 
 extern "C" {
 #define PIXMAN_DONT_DEFINE_STDINT
 #include "pixman.h"
 }
 #include "gfxPlatformGtk.h"
 #include "gfxContext.h"
 #include "gfxImageSurface.h"
@@ -116,16 +117,17 @@ extern "C" {
 #include "nsShmImage.h"
 
 #include "nsIDOMWheelEvent.h"
 
 #include "nsWindow.h"
 
 using namespace mozilla;
 using namespace mozilla::widget;
+using namespace mozilla::layers;
 using mozilla::gl::GLContext;
 using mozilla::layers::LayerManagerOGL;
 
 // Don't put more than this many rects in the dirty region, just fluff
 // out to the bounding-box if there are more
 #define MAX_RECTS_IN_REGION 100
 
 const gint kEvents = GDK_EXPOSURE_MASK | GDK_STRUCTURE_MASK |