diff --git a/libavfilter/vf_mp.c b/libavfilter/vf_mp.c
index 01a8f064a2..0642b44f00 100644
--- a/libavfilter/vf_mp.c
+++ b/libavfilter/vf_mp.c
@@ -882,7 +882,7 @@ static void end_frame(AVFilterLink *inlink)
     }
     free_mp_image(mpi);
 
-//    avfilter_unref_buffer(inpic);
+    avfilter_unref_buffer(inpic);
 }
 
 AVFilter avfilter_vf_mp = {