diff --git a/src/Common/src/Interop/Windows/User32/Interop.GetUserObjectInformation.cs b/src/Common/src/Interop/Windows/User32/Interop.GetUserObjectInformation.cs
index 82df65c8f120..9afdf0ca6ae4 100644
--- a/src/Common/src/Interop/Windows/User32/Interop.GetUserObjectInformation.cs
+++ b/src/Common/src/Interop/Windows/User32/Interop.GetUserObjectInformation.cs
@@ -10,6 +10,6 @@ internal partial class Interop
     internal partial class User32
     {
         [DllImport(Libraries.User32, SetLastError=true, CharSet = CharSet.Unicode, ExactSpelling = true)]
-        public static extern bool GetUserObjectInformationW(IntPtr hObj, int nIndex, [MarshalAs(UnmanagedType.LPStruct)] USEROBJECTFLAGS pvBuffer, int nLength, ref int lpnLengthNeeded);
+        public static extern bool GetUserObjectInformationW(IntPtr hObj, int nIndex, ref USEROBJECTFLAGS pvBuffer, int nLength, ref int lpnLengthNeeded);
     }
 }
diff --git a/src/Common/src/Interop/Windows/User32/Interop.USEROBJECTFLAGS.cs b/src/Common/src/Interop/Windows/User32/Interop.USEROBJECTFLAGS.cs
index 38f4cc3e97fe..f52e0cdd3150 100644
--- a/src/Common/src/Interop/Windows/User32/Interop.USEROBJECTFLAGS.cs
+++ b/src/Common/src/Interop/Windows/User32/Interop.USEROBJECTFLAGS.cs
@@ -8,11 +8,10 @@ internal partial class Interop
 {
     internal partial class User32
     {
-        [StructLayout(LayoutKind.Sequential)]
-        internal class USEROBJECTFLAGS {
-            public int fInherit = 0;
-            public int fReserved = 0;
-            public int dwFlags = 0;
+        internal struct USEROBJECTFLAGS {
+            public int fInherit;
+            public int fReserved;
+            public int dwFlags;
         }
     }
 }
diff --git a/src/Microsoft.Win32.SystemEvents/src/Microsoft/Win32/SystemEvents.cs b/src/Microsoft.Win32.SystemEvents/src/Microsoft/Win32/SystemEvents.cs
index 4ab55405805a..ca7ba8d1e0af 100644
--- a/src/Microsoft.Win32.SystemEvents/src/Microsoft/Win32/SystemEvents.cs
+++ b/src/Microsoft.Win32.SystemEvents/src/Microsoft/Win32/SystemEvents.cs
@@ -90,7 +90,7 @@ private SystemEvents()
         [SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")]
         private static volatile IntPtr s_processWinStation = IntPtr.Zero;
         private static volatile bool s_isUserInteractive = false;
-        private static bool UserInteractive
+        private unsafe static bool UserInteractive
         {
             get
             {
@@ -106,7 +106,7 @@ private static bool UserInteractive
                         int lengthNeeded = 0;
                         Interop.User32.USEROBJECTFLAGS flags = new Interop.User32.USEROBJECTFLAGS();
 
-                        if (Interop.User32.GetUserObjectInformationW(hwinsta, Interop.User32.UOI_FLAGS, flags, Marshal.SizeOf(flags), ref lengthNeeded))
+                        if (Interop.User32.GetUserObjectInformationW(hwinsta, Interop.User32.UOI_FLAGS, ref flags, sizeof(Interop.User32.USEROBJECTFLAGS), ref lengthNeeded))
                         {
                             if ((flags.dwFlags & Interop.User32.WSF_VISIBLE) == 0)
                             {