diff --git a/src/NHibernate/Proxy/FieldInterceptorProxyBuilder.cs b/src/NHibernate/Proxy/FieldInterceptorProxyBuilder.cs
index f3255a2aaab..4fed7814108 100644
--- a/src/NHibernate/Proxy/FieldInterceptorProxyBuilder.cs
+++ b/src/NHibernate/Proxy/FieldInterceptorProxyBuilder.cs
@@ -57,10 +57,9 @@ public static TypeInfo CreateProxyType(System.Type baseType)
 
 			var assemblyBuilder = ProxyBuilderHelper.DefineDynamicAssembly(AppDomain.CurrentDomain, name);
 
-#if NETFX || NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
 			if (!baseType.IsVisible)
 				ProxyBuilderHelper.GenerateInstanceOfIgnoresAccessChecksToAttribute(assemblyBuilder, baseType.Assembly.GetName().Name);
-#endif
+
 			var moduleBuilder = ProxyBuilderHelper.DefineDynamicModule(assemblyBuilder, moduleName);
 
 			const TypeAttributes typeAttributes = TypeAttributes.AutoClass | TypeAttributes.Class | TypeAttributes.Public | TypeAttributes.BeforeFieldInit;