diff --git a/src/gl/dynlights/a_dynlight.cpp b/src/gl/dynlights/a_dynlight.cpp
index e7d41aa22..d1b71a38d 100644
--- a/src/gl/dynlights/a_dynlight.cpp
+++ b/src/gl/dynlights/a_dynlight.cpp
@@ -595,7 +595,7 @@ void ADynamicLight::CollectWithinRadius(const fixedvec3 &pos, subsector_t *subSe
 			}
 		}
 	}
-	if (subSec->sector->PortalIsLinked(sector_t::ceiling))
+	if (!subSec->sector->PortalBlocksSight(sector_t::ceiling))
 	{
 		line_t *other = subSec->firstline->linedef;
 		AActor *sb = subSec->sector->SkyBoxes[sector_t::ceiling];
@@ -606,7 +606,7 @@ void ADynamicLight::CollectWithinRadius(const fixedvec3 &pos, subsector_t *subSe
 			if (othersub->validcount != ::validcount) CollectWithinRadius(PosRelative(othersub->sector), othersub, radius);
 		}
 	}
-	if (subSec->sector->PortalIsLinked(sector_t::floor))
+	if (!subSec->sector->PortalBlocksSight(sector_t::floor))
 	{
 		line_t *other = subSec->firstline->linedef;
 		AActor *sb = subSec->sector->SkyBoxes[sector_t::floor];