diff --git a/examples/dxPtexViewer/dxPtexViewer.cpp b/examples/dxPtexViewer/dxPtexViewer.cpp
index dec13cc4..dc4ca77b 100755
--- a/examples/dxPtexViewer/dxPtexViewer.cpp
+++ b/examples/dxPtexViewer/dxPtexViewer.cpp
@@ -1493,7 +1493,7 @@ initD3D11(HWND hWnd) {
     D3D11_RASTERIZER_DESC rasterDesc;
     ZeroMemory(&rasterDesc, sizeof(rasterDesc));
     rasterDesc.AntialiasedLineEnable = false;
-    rasterDesc.CullMode = D3D11_CULL_NONE; // XXX
+    rasterDesc.CullMode = D3D11_CULL_BACK;
     rasterDesc.DepthBias = 0;
     rasterDesc.DepthBiasClamp = 0.0f;
     rasterDesc.DepthClipEnable = true;
diff --git a/examples/dxViewer/dxviewer.cpp b/examples/dxViewer/dxviewer.cpp
index e5b643c8..55b4309e 100644
--- a/examples/dxViewer/dxviewer.cpp
+++ b/examples/dxViewer/dxviewer.cpp
@@ -1259,8 +1259,7 @@ initD3D11(HWND hWnd) {
     D3D11_RASTERIZER_DESC rasterDesc;
     ZeroMemory(&rasterDesc, sizeof(rasterDesc));
     rasterDesc.AntialiasedLineEnable = false;
-    //rasterDesc.CullMode = D3D11_CULL_NONE; // XXX
-    rasterDesc.CullMode = D3D11_CULL_BACK; // XXX
+    rasterDesc.CullMode = D3D11_CULL_BACK;
     rasterDesc.DepthBias = 0;
     rasterDesc.DepthBiasClamp = 0.0f;
     rasterDesc.DepthClipEnable = true;