diff --git a/src/hwrenderer/scene/hw_bsp.cpp b/src/hwrenderer/scene/hw_bsp.cpp
index 075a93d8f..31a3694ee 100644
--- a/src/hwrenderer/scene/hw_bsp.cpp
+++ b/src/hwrenderer/scene/hw_bsp.cpp
@@ -702,6 +702,21 @@ void HWDrawInfo::DoSubsector(subsector_t * sub)
 				ss_renderflags[sub->Index()] = 
 					(sub->numlines > 2) ? SSRF_PROCESSED|SSRF_RENDERALL : SSRF_PROCESSED;
 				if (sub->hacked & 1) AddHackedSubsector(sub);
+
+				// This is for portal coverage.
+				FSectorPortalGroup *portal;
+
+				portal = fakesector->GetPortalGroup(sector_t::ceiling);
+				if (portal != nullptr)
+				{
+					AddSubsectorToPortal(portal, sub);
+				}
+
+				portal = fakesector->GetPortalGroup(sector_t::floor);
+				if (portal != nullptr)
+				{
+					AddSubsectorToPortal(portal, sub);
+				}
 			}
 		}
 	}
diff --git a/src/hwrenderer/scene/hw_drawinfo.cpp b/src/hwrenderer/scene/hw_drawinfo.cpp
index 40bdb8a7a..803b70c12 100644
--- a/src/hwrenderer/scene/hw_drawinfo.cpp
+++ b/src/hwrenderer/scene/hw_drawinfo.cpp
@@ -655,3 +655,22 @@ void HWDrawInfo::ProcessScene(bool toscreen, const std::function<void(HWDrawInfo
 	DrawScene(this, toscreen ? DM_MAINVIEW : DM_OFFSCREEN);
 
 }
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+void HWDrawInfo::AddSubsectorToPortal(FSectorPortalGroup *ptg, subsector_t *sub)
+{
+	auto portal = FindPortal(ptg);
+	if (!portal)
+	{
+		portal = new HWScenePortal(screen->mPortalState, new HWSectorStackPortal(ptg));
+		Portals.Push(portal);
+	}
+	auto ptl = static_cast<HWSectorStackPortal*>(static_cast<HWScenePortal*>(portal)->mScene);
+	ptl->AddSubsector(sub);
+}
+
diff --git a/src/hwrenderer/scene/hw_drawinfo.h b/src/hwrenderer/scene/hw_drawinfo.h
index 33074b0fd..6fc0e212f 100644
--- a/src/hwrenderer/scene/hw_drawinfo.h
+++ b/src/hwrenderer/scene/hw_drawinfo.h
@@ -300,6 +300,7 @@ public:
 	void DrawPlayerSprites(bool hudModelStep, FRenderState &state);
 
 	void ProcessLowerMinisegs(TArray<seg_t *> &lowersegs);
+    void AddSubsectorToPortal(FSectorPortalGroup *portal, subsector_t *sub);
     
     void AddWall(GLWall *w);
     void AddMirrorSurface(GLWall *w);
diff --git a/src/hwrenderer/scene/hw_renderhacks.cpp b/src/hwrenderer/scene/hw_renderhacks.cpp
index 1558b4bba..5592a03ab 100644
--- a/src/hwrenderer/scene/hw_renderhacks.cpp
+++ b/src/hwrenderer/scene/hw_renderhacks.cpp
@@ -1393,22 +1393,4 @@ void HWDrawInfo::ProcessSectorStacks(area_t in_area)
 	CeilingStacks.Clear();
 }
 
-//==========================================================================
-//
-//
-//
-//==========================================================================
-
-void HWDrawInfo::AddSubsectorToPortal(FSectorPortalGroup *ptg, subsector_t *sub)
-{
-	auto portal = FindPortal(ptg);
-	if (!portal)
-	{
-		portal = new HWScenePortal(screen->mPortalState, new HWSectorStackPortal(ptg));
-		Portals.Push(portal);
-	}
-	auto ptl = static_cast<HWSectorStackPortal*>(static_cast<HWScenePortal*>(portal)->mScene);
-	ptl->AddSubsector(sub);
-}
-
 #endif