diff --git a/src/gl/scene/gl_flats.cpp b/src/gl/scene/gl_flats.cpp
index 6d563f1a7..0ec2b5149 100644
--- a/src/gl/scene/gl_flats.cpp
+++ b/src/gl/scene/gl_flats.cpp
@@ -602,7 +602,7 @@ void GLFlat::ProcessSector(sector_t * frontsector)
 			alpha = 1.0f - frontsector->GetReflect(sector_t::floor);
 		}
 
-		if (alpha != 0.f && sector->GetTexture(sector_t::floor) != skyflatnum)
+		if (alpha != 0.f && frontsector->GetTexture(sector_t::floor) != skyflatnum)
 		{
 			if (frontsector->VBOHeightcheck(sector_t::floor))
 			{
@@ -661,7 +661,7 @@ void GLFlat::ProcessSector(sector_t * frontsector)
 			alpha = 1.0f - frontsector->GetReflect(sector_t::ceiling);
 		}
 
-		if (alpha != 0.f && sector->GetTexture(sector_t::ceiling) != skyflatnum)
+		if (alpha != 0.f && frontsector->GetTexture(sector_t::ceiling) != skyflatnum)
 		{
 			if (frontsector->VBOHeightcheck(sector_t::ceiling))
 			{