diff --git a/include/GL/gl.h b/include/GL/gl.h
index 23bd32b..58bff5b 100644
--- a/include/GL/gl.h
+++ b/include/GL/gl.h
@@ -409,6 +409,7 @@ __BEGIN_DECLS
 #define GL_TRUE    1
 
 /* Stubs for portability */
+#define GL_LINE_SMOOTH                    0x0B20
 #define GL_ALPHA_TEST                     0x0BC0
 #define GL_STENCIL_TEST                   0x0B90
 #define GL_UNPACK_SWAP_BYTES              0x0CF0