diff --git a/src/Features/InteriorSunShadows.cpp b/src/Features/InteriorSunShadows.cpp
index ea766f2756..41ea4f1c0d 100644
--- a/src/Features/InteriorSunShadows.cpp
+++ b/src/Features/InteriorSunShadows.cpp
@@ -46,7 +46,7 @@ void InteriorSunShadows::EarlyPrepass()
 
 inline bool InteriorSunShadows::IsInteriorWithSun(const RE::TESObjectCELL* cell)
 {
-	return cell && cell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting);
+	return cell && cell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting, static_cast<RE::TESObjectCELL::Flag>(CellFlagExt::kSunlightShadows));
 }
 
 RE::TESWorldSpace* InteriorSunShadows::GetWorldSpace::thunk(RE::TES* tes)
diff --git a/src/Features/InteriorSunShadows.h b/src/Features/InteriorSunShadows.h
index 9590a6b229..0139654a53 100644
--- a/src/Features/InteriorSunShadows.h
+++ b/src/Features/InteriorSunShadows.h
@@ -51,7 +51,14 @@ struct InteriorSunShadows : Feature
 		}
 	}
 
+	static bool IsInteriorWithSun(const RE::TESObjectCELL* cell);
+
 private:
+	enum class CellFlagExt : uint16_t
+	{
+		kSunlightShadows = 1 << 15,
+	};
+
 	float* gShadowDistance = nullptr;
 	uint32_t* rasterStateCullMode = nullptr;
 
@@ -69,8 +76,6 @@ struct InteriorSunShadows : Feature
 
 	void InitialiseOnNewCell(const RE::NiPointer<RE::BSPortalGraph>& portalGraph);
 
-	static bool IsInteriorWithSun(const RE::TESObjectCELL* cell);
-
 	bool IsInSunDirectionAndWithinShadowDistance(const RE::NiPointer<RE::NiAVObject>& object, const RE::NiPoint3& lightDir, const RE::NiPoint3& playerPos) const;
 
 	void PopulateReplacementJobArrays(RE::TESObjectCELL* cell, const RE::NiPointer<RE::BSPortalGraph>& portalGraph, const RE::BSShadowDirectionalLight* dirLight, RE::BSTArray<RE::BSTArray<RE::NiPointer<RE::NiAVObject>>>& jobArrays);
diff --git a/src/Features/VolumetricLighting.cpp b/src/Features/VolumetricLighting.cpp
index 3ca48cc947..5b1094e28d 100644
--- a/src/Features/VolumetricLighting.cpp
+++ b/src/Features/VolumetricLighting.cpp
@@ -1,5 +1,6 @@
 #include "VolumetricLighting.h"
 
+#include "InteriorSunShadows.h"
 #include "ShaderCache.h"
 #include "State.h"
 
@@ -189,7 +190,7 @@ void VolumetricLighting::EarlyPrepass()
 
 	initialised = true;
 	inInterior = currentlyInInterior;
-	inInteriorWithSunShadows = interiorCell && interiorCell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting);
+	inInteriorWithSunShadows = InteriorSunShadows::IsInteriorWithSun(interiorCell);
 	SetupVL();
 }