diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index 07e9025335..841075193e 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -766,6 +766,7 @@ static int config_props(AVFilterLink *outlink)
     av_freep(&flags_val);
 
     if (ctx->filter != &ff_vf_scale2ref) {
+        ff_framesync_uninit(&scale->fs);
         ret = ff_framesync_init(&scale->fs, ctx, ctx->nb_inputs);
         if (ret < 0)
             return ret;