diff --git a/tests/Avalonia.Benchmarks/NullGlyphRun.cs b/tests/Avalonia.Benchmarks/NullGlyphRun.cs
new file mode 100644
index 0000000000..5ba0822649
--- /dev/null
+++ b/tests/Avalonia.Benchmarks/NullGlyphRun.cs
@@ -0,0 +1,11 @@
+using Avalonia.Platform;
+
+namespace Avalonia.Benchmarks
+{
+    internal class NullGlyphRun : IGlyphRunImpl
+    {
+        public void Dispose()
+        {
+        }
+    }
+}
diff --git a/tests/Avalonia.Benchmarks/NullRenderingPlatform.cs b/tests/Avalonia.Benchmarks/NullRenderingPlatform.cs
index 101d40f00a..1f983069c2 100644
--- a/tests/Avalonia.Benchmarks/NullRenderingPlatform.cs
+++ b/tests/Avalonia.Benchmarks/NullRenderingPlatform.cs
@@ -72,7 +72,9 @@ namespace Avalonia.Benchmarks
 
         public IGlyphRunImpl CreateGlyphRun(GlyphRun glyphRun, out double width)
         {
-            throw new NotImplementedException();
+            width = default;
+
+            return new NullGlyphRun();
         }
     }
 }