diff --git a/source/d3d8to9_device.cpp b/source/d3d8to9_device.cpp
index 0be6422..0e5f014 100644
--- a/source/d3d8to9_device.cpp
+++ b/source/d3d8to9_device.cpp
@@ -725,7 +725,6 @@ HRESULT STDMETHODCALLTYPE Direct3DDevice8::SetRenderState(D3DRENDERSTATETYPE Sta
 	switch (static_cast<DWORD>(State))
 	{
 	case D3DRS_ZVISIBLE:
-		return D3DERR_INVALIDCALL;
 	case D3DRS_PATCHSEGMENTS:
 	case D3DRS_LINEPATTERN:
 	case D3DRS_SOFTWAREVERTEXPROCESSING:
@@ -756,7 +755,6 @@ HRESULT STDMETHODCALLTYPE Direct3DDevice8::GetRenderState(D3DRENDERSTATETYPE Sta
 	switch (static_cast<DWORD>(State))
 	{
 	case D3DRS_ZVISIBLE:
-		return D3DERR_INVALIDCALL;
 	case D3DRS_LINEPATTERN:
 		*pValue = 0;
 		return D3D_OK;