diff --git a/include/osg/StateSet b/include/osg/StateSet
index 6d273e287..e0874763b 100644
--- a/include/osg/StateSet
+++ b/include/osg/StateSet
@@ -22,6 +22,11 @@
 #include <vector>
 #include <string>
 
+#ifndef GL_RESCALE_NORMAL
+// allow compilation against GL1.1 headers.
+#define GL_RESCALE_NORMAL                 0x803A
+#endif
+
 namespace osg {
 
 /**