diff --git a/src/Skia/Avalonia.Skia/TextShaperImpl.cs b/src/Skia/Avalonia.Skia/TextShaperImpl.cs
index e0f95bac60..def2482af3 100644
--- a/src/Skia/Avalonia.Skia/TextShaperImpl.cs
+++ b/src/Skia/Avalonia.Skia/TextShaperImpl.cs
@@ -161,6 +161,8 @@ namespace Avalonia.Skia
 
             if (MemoryMarshal.TryGetArray(memory, out var segment))
             {
+                start = segment.Offset;
+                length = segment.Count;
                 return segment.Array.AsMemory();
             }
 
diff --git a/src/Windows/Avalonia.Direct2D1/Media/TextShaperImpl.cs b/src/Windows/Avalonia.Direct2D1/Media/TextShaperImpl.cs
index fffa5ce490..ac441108e3 100644
--- a/src/Windows/Avalonia.Direct2D1/Media/TextShaperImpl.cs
+++ b/src/Windows/Avalonia.Direct2D1/Media/TextShaperImpl.cs
@@ -161,6 +161,8 @@ namespace Avalonia.Direct2D1.Media
 
             if (MemoryMarshal.TryGetArray(memory, out var segment))
             {
+                start = segment.Offset;
+                length = segment.Count;
                 return segment.Array.AsMemory();
             }
 
diff --git a/tests/Avalonia.UnitTests/HarfBuzzTextShaperImpl.cs b/tests/Avalonia.UnitTests/HarfBuzzTextShaperImpl.cs
index 566cb0f1ac..baf5ffb07c 100644
--- a/tests/Avalonia.UnitTests/HarfBuzzTextShaperImpl.cs
+++ b/tests/Avalonia.UnitTests/HarfBuzzTextShaperImpl.cs
@@ -161,6 +161,8 @@ namespace Avalonia.UnitTests
 
             if (MemoryMarshal.TryGetArray(memory, out var segment))
             {
+                start = segment.Offset;
+                length = segment.Count;
                 return segment.Array.AsMemory();
             }