diff --git a/src/Hooks.h b/src/Hooks.h
index f0402a7..436730e 100644
--- a/src/Hooks.h
+++ b/src/Hooks.h
@@ -4,9 +4,9 @@
 
 struct SetBookShaderHook
 {
-	static RE::NiAVObject* thunk(RE::TESObjectREFR& a_this, bool a_loadInBackground)
+	static char thunk(RE::TESObjectREFR& a_this)
 	{
-		const auto ret = func(a_this, a_loadInBackground);
+		const auto ret = func(a_this);
 
 		TryAddBookRefShader(&a_this);
 
@@ -18,7 +18,7 @@ struct SetBookShaderHook
 	static void Install()
 	{
 		REL::Relocation<uintptr_t> vTable(RE::TESObjectREFR::VTABLE[0]);
-		func = vTable.write_vfunc(0x6A, thunk); // NiAVObject* Load3D(bool a_backgroundLoading)
+		func = vTable.write_vfunc(0x66, thunk); // NiAVObject* Load3D(bool a_backgroundLoading)
 		logger::info("Added book shader hook");
 	}
 };