diff --git a/src/Generator/Generators/CLI/CLIHelpers.cs b/src/Generator/Generators/CLI/CLIHelpers.cs
index 231f2237..07938eb1 100644
--- a/src/Generator/Generators/CLI/CLIHelpers.cs
+++ b/src/Generator/Generators/CLI/CLIHelpers.cs
@@ -438,6 +438,10 @@ namespace Cxxi.Generators.CLI
         {
             for (var i = 0; i < method.Parameters.Count; ++i)
             {
+                if (method.Conversion == MethodConversionType.FunctionToInstanceMethod
+                    && i == 0)
+                    continue;
+
                 var param = method.Parameters[i];
                 Write("{0}", TypeSig.GetArgumentString(param));
                 if (i < method.Parameters.Count - 1)
diff --git a/src/Generator/Generators/CLI/CLIMarshal.cs b/src/Generator/Generators/CLI/CLIMarshal.cs
index 8a801f3c..100b7f15 100644
--- a/src/Generator/Generators/CLI/CLIMarshal.cs
+++ b/src/Generator/Generators/CLI/CLIMarshal.cs
@@ -436,6 +436,15 @@ namespace Cxxi.Generators.CLI
                 if (!Context.Parameter.Type.IsPointer())
                     Return.Write("*");
 
+                var method = Context.Function as Method;
+                if (method != null
+                    && method.Conversion == MethodConversionType.FunctionToInstanceMethod
+                    && Context.ParameterIndex == 0)
+                {
+                    Return.Write("NativePtr");
+                    return true;
+                }
+
                 Return.Write("{0}->NativePtr", Context.Parameter.Name);
             }