diff --git a/src/ImageSharp/Formats/Jxl/IO/Metadata/JxlOpsinInverseMatrix.cs b/src/ImageSharp/Formats/Jxl/IO/Metadata/JxlOpsinInverseMatrix.cs
index dc44594d9..ef74d8012 100644
--- a/src/ImageSharp/Formats/Jxl/IO/Metadata/JxlOpsinInverseMatrix.cs
+++ b/src/ImageSharp/Formats/Jxl/IO/Metadata/JxlOpsinInverseMatrix.cs
@@ -1,6 +1,8 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+#pragma warning disable SA1401 // Fields should be private
+
 using SixLabors.ImageSharp.Formats.Jxl.Fields;
 using SixLabors.ImageSharp.Formats.Jxl.Processing;
 
@@ -8,17 +10,13 @@ namespace SixLabors.ImageSharp.Formats.Jxl.IO.Metadata;
 
 internal sealed class JxlOpsinInverseMatrix : IJxlFields
 {
-    public bool AllDefault { get; set; }
+    public InlineArray3<float> OpsinBiases;
 
-    public JxlMatrix3x3F InverseMatrix { get; set; }
+    public InlineArray3<float> QuantBiases;
 
-    // Prefer arrays so we can set values like this:
-    //      JxlOpsinInverseMatrix m = ...;
-    //      m.OpsinBiases[0] = 1f;
-    // An InlineArray can't do that.
-    public float[] OpsinBiases { get; set; } = new float[3];
+    public bool AllDefault { get; set; }
 
-    public float[] QuantBiases { get; set; } = new float[4];
+    public JxlMatrix3x3F InverseMatrix { get; set; }
 
     public bool Visit(JxlVisitor visitor) => throw new NotImplementedException();
 }
diff --git a/src/ImageSharp/Formats/Jxl/Processing/Decoder/JxlOpsinParameters.cs b/src/ImageSharp/Formats/Jxl/Processing/Decoder/JxlOpsinParameters.cs
index c18a18ef0..6fdfa28f9 100644
--- a/src/ImageSharp/Formats/Jxl/Processing/Decoder/JxlOpsinParameters.cs
+++ b/src/ImageSharp/Formats/Jxl/Processing/Decoder/JxlOpsinParameters.cs
@@ -1,18 +1,17 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+#pragma warning disable SA1401 // Fields should be private
+
 namespace SixLabors.ImageSharp.Formats.Jxl.Processing.Decoder;
 
 internal sealed class JxlOpsinParameters
 {
-    // Use arrays instead of InlineArrays because, with inline arrays we can't do:
-    //      JxlOpsinParameters parameters = ...;
-    //      parameters.OpsinBiasesCbrt[0] /* <-- error */ = 1.25f;
-    public float[] InverseOpsinMatrix { get; set; } = new float[36];
+    public InlineArray36<float> InverseOpsinMatrix;
 
-    public float[] OpsinBiases { get; set; } = new float[4];
+    public InlineArray4<float> OpsinBiases;
 
-    public float[] OpsinBiasesCbrt { get; set; } = new float[4];
+    public InlineArray4<float> OpsinBiasesCbrt;
 
-    public float[] QuantBiases { get; set; } = new float[4];
+    public InlineArray4<float> QuantBiases;
 }