diff --git a/util/test/demos/d3d11/d3d11_shader_debug_zoo.cpp b/util/test/demos/d3d11/d3d11_shader_debug_zoo.cpp
index f13999dff..116518bfb 100644
--- a/util/test/demos/d3d11/d3d11_shader_debug_zoo.cpp
+++ b/util/test/demos/d3d11/d3d11_shader_debug_zoo.cpp
@@ -520,7 +520,7 @@ float4 main(v2f IN) : SV_Target0
   {
     uint width = 0, height = 0, numLevels = 0;
     dimtex.GetDimensions(10, width, height, numLevels);
-    return float4(width, height, numLevels, 0.0f);
+    return float4(max(1,width), max(1,height), numLevels, 0.0f);
   }
 
   if(IN.tri == 59)
@@ -548,7 +548,7 @@ float4 main(v2f IN) : SV_Target0
 
     uint width = 0, height = 0, numLevels = 0;
     dimtex.GetDimensions(z+10, width, height, numLevels);
-    return float4(width, height, numLevels, 0.0f);
+    return float4(max(1,width), max(1,height), numLevels, 0.0f);
   }
 
   return float4(0.4f, 0.4f, 0.4f, 0.4f);