diff --git a/src/coreclr/nativeaot/Common/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs b/src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs
similarity index 100%
rename from src/coreclr/nativeaot/Common/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs
rename to src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs
diff --git a/src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj b/src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj
index 39337d896cbd20..979e19a5bdae5a 100644
--- a/src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj
+++ b/src/coreclr/nativeaot/System.Private.CoreLib/src/System.Private.CoreLib.csproj
@@ -89,6 +89,7 @@
     <Compile Include="Internal\IntrinsicSupport\EqualityComparerHelpers.cs" />
     <Compile Include="Internal\Reflection\Augments\ReflectionAugments.cs" />
     <Compile Include="Internal\Runtime\CompilerServices\Unsafe.cs" />
+    <Compile Include="Internal\Runtime\IDynamicInterfaceCastableSupport.cs" />
     <Compile Include="Internal\Runtime\MethodTable.Runtime.cs" />
     <Compile Include="Internal\Runtime\CompilerHelpers\ThrowHelpers.cs" />
     <Compile Include="Internal\Runtime\CompilerHelpers\MathHelpers.cs" />
@@ -370,9 +371,6 @@
     <Compile Include="$(CompilerCommonPath)\Internal\Runtime\CanonTypeKind.cs">
       <Link>Internal\Runtime\CanonTypeKind.cs</Link>
     </Compile>
-    <Compile Include="$(AotCommonPath)\Internal\Runtime\IDynamicInterfaceCastableSupport.cs">
-      <Link>Internal\Runtime\IDynamicInterfaceCastableSupport.cs</Link>
-    </Compile>
     <Compile Include="$(AotCommonPath)\Internal\Runtime\MethodTable.cs">
       <Link>Internal\Runtime\MethodTable.cs</Link>
     </Compile>
diff --git a/src/coreclr/nativeaot/Test.CoreLib/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs b/src/coreclr/nativeaot/Test.CoreLib/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs
new file mode 100644
index 00000000000000..c4b3a714299bd7
--- /dev/null
+++ b/src/coreclr/nativeaot/Test.CoreLib/src/Internal/Runtime/IDynamicInterfaceCastableSupport.cs
@@ -0,0 +1,24 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime;
+
+namespace Internal.Runtime
+{
+    static unsafe class IDynamicCastableSupport
+    {
+        [RuntimeExport("IDynamicCastableIsInterfaceImplemented")]
+        internal static bool IDynamicCastableIsInterfaceImplemented(object instance, MethodTable* interfaceType, bool throwIfNotImplemented)
+        {
+            return false;
+        }
+
+        [RuntimeExport("IDynamicCastableGetInterfaceImplementation")]
+        internal static IntPtr IDynamicCastableGetInterfaceImplementation(object instance, MethodTable* interfaceType, ushort slot)
+        {
+            RuntimeImports.RhpFallbackFailFast();
+            return default;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/coreclr/nativeaot/Test.CoreLib/src/System/RuntimeExceptionHelpers.cs b/src/coreclr/nativeaot/Test.CoreLib/src/System/RuntimeExceptionHelpers.cs
index 40721f9c53ac80..777b5790d145b6 100644
--- a/src/coreclr/nativeaot/Test.CoreLib/src/System/RuntimeExceptionHelpers.cs
+++ b/src/coreclr/nativeaot/Test.CoreLib/src/System/RuntimeExceptionHelpers.cs
@@ -119,5 +119,10 @@ private static void AppendExceptionStackFrame(object exceptionObj, IntPtr IP, in
         internal static void OnFirstChanceException(object e)
         {
         }
+
+        [RuntimeExport("OnUnhandledException")]
+        internal static void OnUnhandledException(object e)
+        {
+        }
     }
 }
diff --git a/src/coreclr/nativeaot/Test.CoreLib/src/Test.CoreLib.csproj b/src/coreclr/nativeaot/Test.CoreLib/src/Test.CoreLib.csproj
index 8a307528473e30..c95cc9c17b8a39 100644
--- a/src/coreclr/nativeaot/Test.CoreLib/src/Test.CoreLib.csproj
+++ b/src/coreclr/nativeaot/Test.CoreLib/src/Test.CoreLib.csproj
@@ -210,6 +210,7 @@
     <Compile Include="..\..\Runtime.Base\src\Internal\Runtime\CompilerServices\Unsafe.cs">
       <Link>Internal\Runtime\CompilerServices\Unsafe.cs</Link>
     </Compile>
+    <Compile Include="Internal\Runtime\IDynamicInterfaceCastableSupport.cs" />
     <Compile Include="System\Runtime\CompilerServices\ClassConstructorRunner.cs" />
     <Compile Include="System\Runtime\CompilerServices\StaticClassConstructionContext.cs" />
     <Compile Include="System\Runtime\InteropServices\InAttribute.cs" />