diff --git a/Iceshrimp.Backend/Core/Helpers/BlurhashHelper.cs b/Iceshrimp.Backend/Core/Helpers/BlurhashHelper.cs
index 49e67734..f5296419 100644
--- a/Iceshrimp.Backend/Core/Helpers/BlurhashHelper.cs
+++ b/Iceshrimp.Backend/Core/Helpers/BlurhashHelper.cs
@@ -16,7 +16,7 @@ public static class BlurhashHelper
 	/// <param name="componentsX">The number of components used on the X-Axis for the DCT</param>
 	/// <param name="componentsY">The number of components used on the Y-Axis for the DCT</param>
 	/// <returns>The resulting Blurhash string</returns>
-	public static string Encode(Span2D<Rgb24> pixels, int componentsX, int componentsY)
+	public static string Encode(ReadOnlySpan2D<Rgb24> pixels, int componentsX, int componentsY)
 	{
 		if (componentsX < 1) throw new ArgumentException("componentsX needs to be at least 1");
 		if (componentsX > 9) throw new ArgumentException("componentsX needs to be at most 9");