diff --git a/src/hwrenderer/scene/hw_walls.cpp b/src/hwrenderer/scene/hw_walls.cpp
index b70c4ebf8..f8ed6d30d 100644
--- a/src/hwrenderer/scene/hw_walls.cpp
+++ b/src/hwrenderer/scene/hw_walls.cpp
@@ -1522,7 +1522,7 @@ void GLWall::Process(HWDrawInfo *di, seg_t *seg, sector_t * frontsector, sector_
 		}
 		v1 = seg->v1;
 		v2 = seg->v2;
-		flags |= GLWF_NOSPLITLOWER | GLWF_NOSPLITLOWER;	// seg-splitting not needed for single segs.
+		flags |= GLWF_NOSPLITUPPER | GLWF_NOSPLITLOWER;	// seg-splitting not needed for single segs.
 	}