diff --git a/proposals/0010-vk-buffer-ref.md b/proposals/0010-vk-buffer-ref.md
index cf1536b7..34991f22 100644
--- a/proposals/0010-vk-buffer-ref.md
+++ b/proposals/0010-vk-buffer-ref.md
@@ -189,9 +189,10 @@ struct TestPushConstant_t
 
 float4 MainPs(void) : SV_Target0
 {
-      block_p g_p = g_PushConstants.root;
+      block_p g_p(g_PushConstants.root);
       g_p = g_p.Get().next;
-      if (uint64_t(g_p) == 0) return float4(0.0,0.0,0.0,0.0);
+      if (!(bool)g_p) // Null pointer test
+          return float4(0.0,0.0,0.0,0.0);
       return g_p.Get().x
 }