diff --git a/dlls/d3d8/d3d8_private.h b/dlls/d3d8/d3d8_private.h
index 141aa9216ee..f6ceeed0f4e 100644
--- a/dlls/d3d8/d3d8_private.h
+++ b/dlls/d3d8/d3d8_private.h
@@ -618,8 +618,6 @@ HRESULT pixelshader_init(IDirect3DPixelShader8Impl *shader, IDirect3DDevice8Impl
 D3DFORMAT d3dformat_from_wined3dformat(WINED3DFORMAT format) DECLSPEC_HIDDEN;
 WINED3DFORMAT wined3dformat_from_d3dformat(D3DFORMAT format) DECLSPEC_HIDDEN;
 void load_local_constants(const DWORD *d3d8_elements, IWineD3DVertexShader *wined3d_vertex_shader) DECLSPEC_HIDDEN;
-UINT convert_to_wined3d_declaration(const DWORD *d3d8_elements, DWORD *d3d8_elements_size,
-        WINED3DVERTEXELEMENT **wined3d_elements) DECLSPEC_HIDDEN;
 size_t parse_token(const DWORD *pToken) DECLSPEC_HIDDEN;
 
 #endif /* __WINE_D3DX8_PRIVATE_H */
diff --git a/dlls/d3d8/vertexdeclaration.c b/dlls/d3d8/vertexdeclaration.c
index bcc9991aead..b876b66c41c 100644
--- a/dlls/d3d8/vertexdeclaration.c
+++ b/dlls/d3d8/vertexdeclaration.c
@@ -301,7 +301,8 @@ static const wined3d_usage_t wined3d_usage_lookup[] = {
 };
 
 /* TODO: find out where rhw (or positionT) is for declaration8 */
-UINT convert_to_wined3d_declaration(const DWORD *d3d8_elements, DWORD *d3d8_elements_size, WINED3DVERTEXELEMENT **wined3d_elements)
+static UINT convert_to_wined3d_declaration(const DWORD *d3d8_elements, DWORD *d3d8_elements_size,
+        WINED3DVERTEXELEMENT **wined3d_elements)
 {
     const DWORD *token = d3d8_elements;
     WINED3DVERTEXELEMENT *element;