diff --git a/opengl/include/EGL/eglext.h b/opengl/include/EGL/eglext.h
index 501bf58..32c21f6 100644
--- a/opengl/include/EGL/eglext.h
+++ b/opengl/include/EGL/eglext.h
@@ -697,6 +697,11 @@
 #define EGL_EXT_device_query 1
 #endif /* EGL_EXT_device_query */
 
+#ifndef EGL_EXT_gl_colorspace_bt2020_hlg
+#define EGL_EXT_gl_colorspace_bt2020_hlg 1
+#define EGL_GL_COLORSPACE_BT2020_HLG_EXT  0x333E
+#endif /* EGL_EXT_gl_colorspace_bt2020_hlg */
+
 #ifndef EGL_EXT_gl_colorspace_bt2020_linear
 #define EGL_EXT_gl_colorspace_bt2020_linear 1
 #define EGL_GL_COLORSPACE_BT2020_LINEAR_EXT 0x333F