diff --git a/src/Refresh.cs b/src/Refresh.cs
index 7fc51c4..46d380f 100644
--- a/src/Refresh.cs
+++ b/src/Refresh.cs
@@ -750,7 +750,7 @@ namespace RefreshCS
         public static extern void Refresh_SetTextureData(
             IntPtr device,
             IntPtr commandBuffer,
-            ref TextureSlice textureSlice,
+            in TextureSlice textureSlice,
             IntPtr data,
             uint dataLengthInBytes
         );