diff --git a/intern/gawain/gawain/primitive.h b/intern/gawain/gawain/primitive.h
index 9140e8a2478..25e02ab09dd 100644
--- a/intern/gawain/gawain/primitive.h
+++ b/intern/gawain/gawain/primitive.h
@@ -38,5 +38,3 @@ typedef enum {
 
 PrimitiveClass prim_class_of_type(PrimitiveType);
 bool prim_type_belongs_to_class(PrimitiveType, PrimitiveClass);
-
-GLenum convert_prim_type_to_gl(PrimitiveType);
diff --git a/intern/gawain/gawain/primitive_private.h b/intern/gawain/gawain/primitive_private.h
new file mode 100644
index 00000000000..e78433ef304
--- /dev/null
+++ b/intern/gawain/gawain/primitive_private.h
@@ -0,0 +1,14 @@
+
+// Gawain geometric primitives (private interface for use inside Gawain)
+//
+// This code is part of the Gawain library, with modifications
+// specific to integration with Blender.
+//
+// Copyright 2017 Mike Erwin
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
+// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#pragma once
+
+GLenum convert_prim_type_to_gl(PrimitiveType);
diff --git a/intern/gawain/src/batch.c b/intern/gawain/src/batch.c
index 33bb31cc3f7..86dca0a214e 100644
--- a/intern/gawain/src/batch.c
+++ b/intern/gawain/src/batch.c
@@ -11,6 +11,7 @@
 
 #include "batch.h"
 #include "buffer_id.h"
+#include "primitive_private.h"
 #include <stdlib.h>
 
 // necessary functions from matrix API
diff --git a/intern/gawain/src/immediate.c b/intern/gawain/src/immediate.c
index 8b6f0fdbff5..af9a48c2f4d 100644
--- a/intern/gawain/src/immediate.c
+++ b/intern/gawain/src/immediate.c
@@ -14,6 +14,7 @@
 #include "attrib_binding.h"
 #include "attrib_binding_private.h"
 #include "vertex_format_private.h"
+#include "primitive_private.h"
 #include <string.h>
 
 // necessary functions from matrix API
diff --git a/intern/gawain/src/primitive.c b/intern/gawain/src/primitive.c
index 90b3686b17d..da32932c1e5 100644
--- a/intern/gawain/src/primitive.c
+++ b/intern/gawain/src/primitive.c
@@ -10,6 +10,7 @@
 // the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
 #include "primitive.h"
+#include "primitive_private.h"
 
 PrimitiveClass prim_class_of_type(PrimitiveType prim_type)
 	{