diff --git a/libavfilter/vf_dctdnoiz.c b/libavfilter/vf_dctdnoiz.c
index 63b1b29ea2..c7f949f9f5 100644
--- a/libavfilter/vf_dctdnoiz.c
+++ b/libavfilter/vf_dctdnoiz.c
@@ -564,6 +564,9 @@ static int config_input(AVFilterLink *inlink)
                inlink->h - s->pr_height);
 
     max_slice_h = s->pr_height / ((s->bsize - 1) * 2);
+    if (max_slice_h == 0)
+        return AVERROR(EINVAL);
+
     s->nb_threads = FFMIN3(MAX_THREADS, ff_filter_get_nb_threads(ctx), max_slice_h);
     av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",
            MAX_THREADS, max_slice_h, ff_filter_get_nb_threads(ctx), s->nb_threads);