diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index c4605c72ce..506254f500 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -573,6 +573,7 @@ static const AVClass scale_class = {
     .item_name        = av_default_item_name,
     .option           = scale_options,
     .version          = LIBAVUTIL_VERSION_INT,
+    .category         = AV_CLASS_CATEGORY_FILTER,
     .child_class_next = child_class_next,
 };