diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 8c70f349d47..0a7112cc64f 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -2885,7 +2885,7 @@ void surface_load_fb_texture(struct wined3d_surface *surface, BOOL srgb, struct
         context_restore(context, restore_rt);
 }
 
-void surface_prepare_rb(struct wined3d_surface *surface, const struct wined3d_gl_info *gl_info, BOOL multisample)
+static void surface_prepare_rb(struct wined3d_surface *surface, const struct wined3d_gl_info *gl_info, BOOL multisample)
 {
     if (multisample)
     {
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index b6e663557fb..a60919e7526 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -2467,8 +2467,6 @@ HRESULT surface_load_location(struct wined3d_surface *surface,
 void surface_modify_ds_location(struct wined3d_surface *surface, DWORD location, UINT w, UINT h) DECLSPEC_HIDDEN;
 void wined3d_surface_prepare(struct wined3d_surface *surface, struct wined3d_context *context,
         DWORD location) DECLSPEC_HIDDEN;
-void surface_prepare_rb(struct wined3d_surface *surface,
-        const struct wined3d_gl_info *gl_info, BOOL multisample) DECLSPEC_HIDDEN;
 void surface_set_compatible_renderbuffer(struct wined3d_surface *surface,
         const struct wined3d_surface *rt) DECLSPEC_HIDDEN;
 void surface_set_texture_target(struct wined3d_surface *surface, GLenum target, GLint level) DECLSPEC_HIDDEN;