diff --git a/src/libraries/System.Drawing.Common/src/Interop/Windows/Interop.Gdi32.cs b/src/libraries/System.Drawing.Common/src/Interop/Windows/Interop.Gdi32.cs
index 8b754d321fa268..192cc9b591fac1 100644
--- a/src/libraries/System.Drawing.Common/src/Interop/Windows/Interop.Gdi32.cs
+++ b/src/libraries/System.Drawing.Common/src/Interop/Windows/Interop.Gdi32.cs
@@ -52,7 +52,7 @@ internal static partial int StartDoc(
 #if NET7_0_OR_GREATER
             [MarshalUsing(typeof(HandleRefMarshaller))]
 #endif
-            HandleRef hDC, DOCINFO lpDocInfo);
+            HandleRef hDC, in DOCINFO lpDocInfo);
 
         [LibraryImport(Libraries.Gdi32, SetLastError = true)]
         internal static partial int StartPage(
@@ -179,7 +179,7 @@ internal unsafe struct BITMAPINFO_FLAT
         [NativeMarshalling(typeof(Marshaller))]
 #endif
         [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
-        internal sealed class DOCINFO
+        internal struct DOCINFO
         {
             internal int cbSize = 20;
             internal string? lpszDocName;
@@ -187,6 +187,8 @@ internal sealed class DOCINFO
             internal string? lpszDatatype;
             internal int fwType;
 
+            public DOCINFO() { }
+
 #if NET7_0_OR_GREATER
             [CustomMarshaller(typeof(DOCINFO), MarshalMode.ManagedToUnmanagedIn, typeof(Marshaller))]
             public static class Marshaller