diff --git a/dlls/wined3d/stateblock.c b/dlls/wined3d/stateblock.c
index 7d2dcffba5f..f8724da967c 100644
--- a/dlls/wined3d/stateblock.c
+++ b/dlls/wined3d/stateblock.c
@@ -1577,6 +1577,13 @@ void CDECL wined3d_stateblock_set_index_buffer(struct wined3d_stateblock *stateb
     stateblock->changed.indices = TRUE;
 }
 
+void CDECL wined3d_stateblock_set_base_vertex_index(struct wined3d_stateblock *stateblock, INT base_index)
+{
+    TRACE("stateblock %p, base_index %d.\n", stateblock, base_index);
+
+    stateblock->stateblock_state.base_vertex_index = base_index;
+}
+
 static void init_default_render_states(DWORD rs[WINEHIGHEST_RENDER_STATE + 1], const struct wined3d_d3d_info *d3d_info)
 {
     union
diff --git a/dlls/wined3d/wined3d.spec b/dlls/wined3d/wined3d.spec
index 614886cc4a1..8a9c9858e92 100644
--- a/dlls/wined3d/wined3d.spec
+++ b/dlls/wined3d/wined3d.spec
@@ -263,6 +263,7 @@
 @ cdecl wined3d_stateblock_decref(ptr)
 @ cdecl wined3d_stateblock_incref(ptr)
 @ cdecl wined3d_stateblock_reset(ptr)
+@ cdecl wined3d_stateblock_set_base_vertex_index(ptr long)
 @ cdecl wined3d_stateblock_set_blend_factor(ptr ptr)
 @ cdecl wined3d_stateblock_set_clip_plane(ptr long ptr)
 @ cdecl wined3d_stateblock_set_index_buffer(ptr ptr long)
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index 7c6b2ef1078..10e2ae70ebd 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2668,6 +2668,7 @@ HRESULT __cdecl wined3d_stateblock_create(struct wined3d_device *device,
 ULONG __cdecl wined3d_stateblock_decref(struct wined3d_stateblock *stateblock);
 ULONG __cdecl wined3d_stateblock_incref(struct wined3d_stateblock *stateblock);
 void __cdecl wined3d_stateblock_reset(struct wined3d_stateblock *stateblock);
+void __cdecl wined3d_stateblock_set_base_vertex_index(struct wined3d_stateblock *stateblock, INT base_index);
 void __cdecl wined3d_stateblock_set_blend_factor(struct wined3d_stateblock *stateblock,
         const struct wined3d_color *blend_factor);
 HRESULT __cdecl wined3d_stateblock_set_clip_plane(struct wined3d_stateblock *stateblock,