diff --git a/src/NetVips/Image.cs b/src/NetVips/Image.cs
index 2426680..ac69cfd 100644
--- a/src/NetVips/Image.cs
+++ b/src/NetVips/Image.cs
@@ -4,7 +4,6 @@ namespace NetVips
     using System.Collections.Generic;
     using System.IO;
     using System.Runtime.InteropServices;
-    using System.Security;
     using System.Text;
     using System.Threading;
     using Internal;
@@ -29,7 +28,6 @@ public partial class Image : VipsObject
         /// <summary>
         /// Internal marshaller delegate for <see cref="EvalDelegate"/>.
         /// </summary>
-        [SuppressUnmanagedCodeSecurity, UnmanagedFunctionPointer(CallingConvention.Cdecl)]
         internal delegate void EvalMarshalDelegate(IntPtr imagePtr, VipsProgress progress, IntPtr userDataPtr);
 
         /// <inheritdoc cref="VipsObject"/>