diff --git a/src/libraries/Common/src/System/Runtime/Serialization/SerializationGuard.cs b/src/libraries/Common/src/System/Runtime/Serialization/SerializationGuard.cs
index 467ba639e79989..fa87cf9c7bb214 100644
--- a/src/libraries/Common/src/System/Runtime/Serialization/SerializationGuard.cs
+++ b/src/libraries/Common/src/System/Runtime/Serialization/SerializationGuard.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Reflection;
+using System.Runtime.CompilerServices;
 
 namespace System.Runtime.Serialization
 {
@@ -10,34 +11,16 @@ namespace System.Runtime.Serialization
     /// </summary>
     internal static partial class SerializationGuard
     {
-        private delegate void ThrowIfDeserializationInProgressWithSwitchDel(string switchName, ref int cachedValue);
-        private static readonly ThrowIfDeserializationInProgressWithSwitchDel? s_throwIfDeserializationInProgressWithSwitch = CreateThrowIfDeserializationInProgressWithSwitchDelegate();
-
-        /// <summary>
-        /// Builds a wrapper delegate for SerializationInfo.ThrowIfDeserializationInProgress(string, ref int),
-        /// since it is not exposed via contracts.
-        /// </summary>
-        private static ThrowIfDeserializationInProgressWithSwitchDel? CreateThrowIfDeserializationInProgressWithSwitchDelegate()
-        {
-            ThrowIfDeserializationInProgressWithSwitchDel? throwIfDeserializationInProgressDelegate = null;
-            MethodInfo? throwMethod = typeof(SerializationInfo).GetMethod("ThrowIfDeserializationInProgress",
-                BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public, null, new Type[] { typeof(string), typeof(int).MakeByRefType() }, Array.Empty<ParameterModifier>());
-
-            if (throwMethod != null)
-            {
-                throwIfDeserializationInProgressDelegate = throwMethod.CreateDelegate<ThrowIfDeserializationInProgressWithSwitchDel>();
-            }
-
-            return throwIfDeserializationInProgressDelegate;
-        }
-
         /// <summary>
         /// Provides access to the internal "ThrowIfDeserializationInProgress" method on <see cref="SerializationInfo"/>.
         /// No-ops if the Serialization Guard feature is disabled or unavailable.
         /// </summary>
         public static void ThrowIfDeserializationInProgress(string switchSuffix, ref int cachedValue)
         {
-            s_throwIfDeserializationInProgressWithSwitch?.Invoke(switchSuffix, ref cachedValue);
+            ThrowIfDeserializationInProgress(null, switchSuffix, ref cachedValue);
+
+            [UnsafeAccessor(UnsafeAccessorKind.StaticMethod, Name = "ThrowIfDeserializationInProgress")]
+            static extern void ThrowIfDeserializationInProgress(SerializationInfo? thisPtr, string switchSuffix, ref int cachedValue);
         }
     }
 }