diff --git a/src/NHibernate/Proxy/NHibernateProxyBuilder.cs b/src/NHibernate/Proxy/NHibernateProxyBuilder.cs
index 5036cce2025..1bc04744afd 100644
--- a/src/NHibernate/Proxy/NHibernateProxyBuilder.cs
+++ b/src/NHibernate/Proxy/NHibernateProxyBuilder.cs
@@ -76,7 +76,6 @@ public TypeInfo CreateProxyType(System.Type baseType, IReadOnlyCollection<System
 				interfaces.Add(baseType);
 			}
 
-#if NETFX || NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
 			var assemblyNamesToIgnoreAccessCheck =
 				new[] {baseType}
 					.Concat(interfaces).Where(i => !i.IsVisible)
@@ -84,9 +83,6 @@ public TypeInfo CreateProxyType(System.Type baseType, IReadOnlyCollection<System
 					.Distinct();
 			foreach (var a in assemblyNamesToIgnoreAccessCheck)
 				ProxyBuilderHelper.GenerateInstanceOfIgnoresAccessChecksToAttribute(assemblyBuilder, a);
-#else
-			interfaces.RemoveWhere(i => !i.IsVisible);
-#endif
 			
 			var typeBuilder = moduleBuilder.DefineType(typeName, typeAttributes, parentType, interfaces.ToArray());