diff --git a/src/coreclr/src/tools/crossgen2/ILCompiler.ReadyToRun/IL/Stubs/PInvokeILEmitter.cs b/src/coreclr/src/tools/crossgen2/ILCompiler.ReadyToRun/IL/Stubs/PInvokeILEmitter.cs
index 573afbce8828540cc912b61db796609e13ae398a..c55726522cd3173f876c0726f59ccfb456f1cb05 100644
--- a/src/coreclr/src/tools/crossgen2/ILCompiler.ReadyToRun/IL/Stubs/PInvokeILEmitter.cs
+++ b/src/coreclr/src/tools/crossgen2/ILCompiler.ReadyToRun/IL/Stubs/PInvokeILEmitter.cs
@@ -79,6 +79,9 @@ private MethodIL EmitIL()
             if (!_importMetadata.Flags.PreserveSig)
                 throw new NotSupportedException();
 
+            if (_targetMethod.HasCustomAttribute("System.Runtime.InteropServices", "LCIDConversionAttribute"))
+                throw new NotSupportedException();
+
             PInvokeILCodeStreams pInvokeILCodeStreams = new PInvokeILCodeStreams();
             ILEmitter emitter = pInvokeILCodeStreams.Emitter;
             ILCodeStream marshallingCodestream = pInvokeILCodeStreams.MarshallingCodeStream;