diff --git a/libmpcodecs/vf_vo.c b/libmpcodecs/vf_vo.c
index 62fcc616bc..c27eb0ad67 100644
--- a/libmpcodecs/vf_vo.c
+++ b/libmpcodecs/vf_vo.c
@@ -193,8 +193,10 @@ static void draw_slice(struct vf_instance_s* vf,
 static void uninit(struct vf_instance_s* vf)
 {
     if (vf->priv) {
+#ifdef USE_ASS
         if (vf->priv->ass_priv)
             ass_done(vf->priv->ass_priv);
+#endif
         free(vf->priv);
     }
 }