diff --git a/src/ImageSharp/Colors/Spaces/Bgra32.cs b/src/ImageSharp/Colors/Spaces/Bgra32.cs
index 4325b1cd64..09475f42c8 100644
--- a/src/ImageSharp/Colors/Spaces/Bgra32.cs
+++ b/src/ImageSharp/Colors/Spaces/Bgra32.cs
@@ -22,7 +22,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector4 backingVector;
+        private readonly Vector4 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Bgra32"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/CieLab.cs b/src/ImageSharp/Colors/Spaces/CieLab.cs
index 505c7a6905..faa6c24724 100644
--- a/src/ImageSharp/Colors/Spaces/CieLab.cs
+++ b/src/ImageSharp/Colors/Spaces/CieLab.cs
@@ -28,7 +28,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="CieLab"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/CieXyz.cs b/src/ImageSharp/Colors/Spaces/CieXyz.cs
index 2dd063163a..9deffe0669 100644
--- a/src/ImageSharp/Colors/Spaces/CieXyz.cs
+++ b/src/ImageSharp/Colors/Spaces/CieXyz.cs
@@ -28,7 +28,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="CieXyz"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/Cmyk.cs b/src/ImageSharp/Colors/Spaces/Cmyk.cs
index 48bd5c83a0..e8f2a41f5c 100644
--- a/src/ImageSharp/Colors/Spaces/Cmyk.cs
+++ b/src/ImageSharp/Colors/Spaces/Cmyk.cs
@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector4 backingVector;
+        private readonly Vector4 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Cmyk"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/Hsl.cs b/src/ImageSharp/Colors/Spaces/Hsl.cs
index 67a0ef094e..5c478ecf14 100644
--- a/src/ImageSharp/Colors/Spaces/Hsl.cs
+++ b/src/ImageSharp/Colors/Spaces/Hsl.cs
@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Hsl"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/Hsv.cs b/src/ImageSharp/Colors/Spaces/Hsv.cs
index 4cd382e782..9df16a27b4 100644
--- a/src/ImageSharp/Colors/Spaces/Hsv.cs
+++ b/src/ImageSharp/Colors/Spaces/Hsv.cs
@@ -27,7 +27,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Hsv"/> struct.
diff --git a/src/ImageSharp/Colors/Spaces/YCbCr.cs b/src/ImageSharp/Colors/Spaces/YCbCr.cs
index a91fdb2d67..9f1479d35b 100644
--- a/src/ImageSharp/Colors/Spaces/YCbCr.cs
+++ b/src/ImageSharp/Colors/Spaces/YCbCr.cs
@@ -23,7 +23,7 @@ namespace ImageSharp.Colors.Spaces
         /// <summary>
         /// The backing vector for SIMD support.
         /// </summary>
-        private Vector3 backingVector;
+        private readonly Vector3 backingVector;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="YCbCr"/> struct.