diff --git a/libavfilter/vf_avgblur.c b/libavfilter/vf_avgblur.c
index b813237258..8110b42aee 100644
--- a/libavfilter/vf_avgblur.c
+++ b/libavfilter/vf_avgblur.c
@@ -273,7 +273,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         const int width = s->planewidth[plane];
 
         if (!(s->planes & (1 << plane))) {
-            if (out != in)
+            if (out->data[plane] != in->data[plane])
                 av_image_copy_plane(out->data[plane], out->linesize[plane],
                                     in->data[plane], in->linesize[plane],
                                     width * ((s->depth + 7) / 8), height);