diff --git a/src/rendering/hwrenderer/scene/hw_portal.cpp b/src/rendering/hwrenderer/scene/hw_portal.cpp
index 4dabec3e2..c5efff0ab 100644
--- a/src/rendering/hwrenderer/scene/hw_portal.cpp
+++ b/src/rendering/hwrenderer/scene/hw_portal.cpp
@@ -978,6 +978,7 @@ void HWHorizonPortal::DrawContents(HWDrawInfo *di, FRenderState &state)
 	}
 
 
+	state.EnableBrightmap(true);
 	state.SetMaterial(texture, UF_Texture, 0, CLAMP_NONE, 0, -1);
 	state.SetObjectColor(origin->specialcolor);