diff --git a/third_party/egl/EGL/eglext.h b/third_party/egl/EGL/eglext.h
index 59913a6e4e6ba2c477b9f1d1698d942e91d4bff3..815de543dbae770f19a4124b6c78c2b20cd31803 100644
--- a/third_party/egl/EGL/eglext.h
+++ b/third_party/egl/EGL/eglext.h
@@ -738,6 +738,11 @@ EGLAPI EGLBoolean EGLAPIENTRY eglQueryDeviceBinaryEXT (EGLDeviceEXT device, EGLi
 #define EGL_GL_COLORSPACE_BT2020_PQ_EXT   0x3340
 #endif /* EGL_EXT_gl_colorspace_bt2020_pq */
 
+#ifndef EGL_EXT_gl_colorspace_bt2020_hlg
+#define EGL_EXT_gl_colorspace_bt2020_hlg 1
+#define EGL_GL_COLORSPACE_BT2020_HLG_EXT   0x3540
+#endif /* EGL_EXT_gl_colorspace_bt2020_hlg */
+
 #ifndef EGL_EXT_gl_colorspace_display_p3
 #define EGL_EXT_gl_colorspace_display_p3 1
 #define EGL_GL_COLORSPACE_DISPLAY_P3_EXT  0x3363