diff --git a/freeglut/freeglut/include/GL/freeglut_ext.h b/freeglut/freeglut/include/GL/freeglut_ext.h
index 0597c0f..98bb9d7 100644
--- a/freeglut/freeglut/include/GL/freeglut_ext.h
+++ b/freeglut/freeglut/include/GL/freeglut_ext.h
@@ -74,7 +74,8 @@
 #define  GLUT_ACTION_ON_WINDOW_CLOSE        0x01F9
 
 #define  GLUT_WINDOW_BORDER_WIDTH           0x01FA
-#define  GLUT_WINDOW_HEADER_HEIGHT          0x01FB
+#define  GLUT_WINDOW_BORDER_HEIGHT          0x01FB
+#define  GLUT_WINDOW_HEADER_HEIGHT          0x01FB  /* Docs say it should always have been GLUT_WINDOW_BORDER_HEIGHT, keep this for backward compatibility */
 
 #define  GLUT_VERSION                       0x01FC