diff --git a/src/osgViewer/GraphicsWindowCarbon.cpp b/src/osgViewer/GraphicsWindowCarbon.cpp
index 02b078988..1bf966dca 100644
--- a/src/osgViewer/GraphicsWindowCarbon.cpp
+++ b/src/osgViewer/GraphicsWindowCarbon.cpp
@@ -13,8 +13,12 @@
 
 #ifdef __APPLE__
 #include <osg/observer_ptr>
+
 #include <osgViewer/api/Carbon/PixelBufferCarbon>
 #include <osgViewer/api/Carbon/GraphicsWindowCarbon>
+
+#include <osg/DeleteHandler>
+
 #include <Carbon/Carbon.h>
 #include <OpenGL/OpenGL.h>
 using namespace osgViewer;
diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index da7f5293e..883dc9903 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -18,6 +18,9 @@
 
 #include <osgViewer/api/Win32/GraphicsWindowWin32>
 #include <osgViewer/api/Win32/PixelBufferWin32>
+
+#include <osg/DeleteHandler>
+
 #include <vector>
 #include <map>
 #include <sstream>