diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index 132745563..32d4ff98a 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -176,7 +176,7 @@ void GLWall::PutPortal(int ptype)
 		if (!portal)
 		{
 			// either a regular skybox or an Eternity-style horizon
-			if (skybox->special1 != SKYBOX_MAP) portal = new GLEEHorizonPortal(skybox);
+			if (skybox->special1 != SKYBOX_SKYVIEWPOINT) portal = new GLEEHorizonPortal(skybox);
 			else portal = new GLSkyboxPortal(skybox);
 		}
 		portal->AddLine(this);
diff --git a/src/r_sky.h b/src/r_sky.h
index 6881f4943..9d33e82a3 100644
--- a/src/r_sky.h
+++ b/src/r_sky.h
@@ -24,13 +24,6 @@
 
 #include "textures/textures.h"
 
-enum
-{
-	SKYBOX_MAP = 0,
-	SKYBOX_PLANE,
-	SKYBOX_HORIZON
-};
-
 extern FTextureID	skyflatnum;
 extern fixed_t		sky1cyl,		sky2cyl;
 extern FTextureID	sky1texture,	sky2texture;