1 files changed, 3 insertions, 5 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/IClosable.cs b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/IClosable.cs
index 847147ade8..4c6169a4e8 100644
--- a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/IClosable.cs
+++ b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/IClosable.cs
@@ -7,6 +7,7 @@
 using System;
 using System.Security;
 using System.Collections;
+using System.Diagnostics;
 using System.Diagnostics.Contracts;
 using System.Runtime.CompilerServices;
 
@@ -27,10 +28,9 @@ namespace System.Runtime.InteropServices.WindowsRuntime
     {
         private IDisposableToIClosableAdapter()
         {
-            Contract.Assert(false, "This class is never instantiated");
+            Debug.Assert(false, "This class is never instantiated");
         }
 
-        [SecurityCritical]
         public void Close()
         {
             IDisposable _this = JitHelpers.UnsafeCast<IDisposable>(this);
@@ -39,15 +39,13 @@ namespace System.Runtime.InteropServices.WindowsRuntime
     }
 
     // Adapter class which converts IDisposable.Dispose calls into IClosable.Close
-    [SecurityCritical]
     internal sealed class IClosableToIDisposableAdapter
     {
         private IClosableToIDisposableAdapter()
         {
-            Contract.Assert(false, "This class is never instantiated");
+            Debug.Assert(false, "This class is never instantiated");
         }
 
-        [SecurityCritical]
         private void Dispose()
         {
             IClosable _this = JitHelpers.UnsafeCast<IClosable>(this);