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diff --git a/intern/opensubdiv/internal/opensubdiv_converter_internal.h b/intern/opensubdiv/internal/opensubdiv_converter_internal.h
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+// Copyright 2018 Blender Foundation. All rights reserved.
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software Foundation,
+// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+// Author: Sergey Sharybin
+
+#ifndef OPENSUBDIV_CONVERTER_INTERNAL_H_
+#define OPENSUBDIV_CONVERTER_INTERNAL_H_
+
+#ifdef _MSC_VER
+#  include <iso646.h>
+#endif
+
+#include <opensubdiv/sdc/options.h>
+#include <opensubdiv/sdc/types.h>
+
+#include "opensubdiv_converter_capi.h"
+
+struct OpenSubdiv_Converter;
+
+namespace opensubdiv_capi {
+
+// Convert scheme type from C-API enum to an OpenSubdiv native enum.
+OpenSubdiv::Sdc::SchemeType getSchemeTypeFromCAPI(OpenSubdiv_SchemeType type);
+
+// Convert face-varying interpolation type from C-API to an OpenSubdiv
+// native enum.
+OpenSubdiv::Sdc::Options::FVarLinearInterpolation
+getFVarLinearInterpolationFromCAPI(
+    OpenSubdiv_FVarLinearInterpolation linear_interpolation);
+
+// Similar to above, just other way around.
+OpenSubdiv_FVarLinearInterpolation
+getCAPIFVarLinearInterpolationFromOSD(
+     OpenSubdiv::Sdc::Options::FVarLinearInterpolation linear_interpolation);
+
+}  // namespace opensubdiv_capi
+
+#endif  // OPENSUBDIV_CONVERTER_INTERNAL_H_