diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 33b9b05cab0a2c1b097b19673284283e20ab7ddf..894e9d33742d910fab9e807cf813c034a747a81c 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -73,10 +73,11 @@ void avfilter_default_end_frame(AVFilterLink *link)
     link->cur_pic = NULL;
 }
 
-AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref)
+AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
 {
     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
     memcpy(ret, ref, sizeof(AVFilterPicRef));
+    ret->perms &= pmask;
     ret->pic->refcount ++;
     return ret;
 }