diff --git a/libavfilter/vf_overlay.c b/libavfilter/vf_overlay.c
index 14304c1918..5f34895058 100644
--- a/libavfilter/vf_overlay.c
+++ b/libavfilter/vf_overlay.c
@@ -238,6 +238,7 @@ static int start_frame_overlay(AVFilterLink *inlink, AVFilterBufferRef *inpicref
     AVFilterContext *ctx = inlink->dst;
     OverlayContext *over = ctx->priv;
 
+    inlink->cur_buf  = NULL;
     over->overpicref = inpicref;
     over->overpicref->pts = av_rescale_q(inpicref->pts, ctx->inputs[OVERLAY]->time_base,
                                          ctx->outputs[0]->time_base);