diff --git a/include/osg/Image b/include/osg/Image
index ec69f4665..6a143e062 100644
--- a/include/osg/Image
+++ b/include/osg/Image
@@ -51,6 +51,10 @@
 #endif
 
 
+#ifndef GL_ABGR_EXT
+#define GL_ABGR_EXT                         0x8000
+#endif
+
 namespace osg {
 
 // forward declare