diff --git a/libavfilter/vf_fps.c b/libavfilter/vf_fps.c
index 5f62ffd078..ea22d37b54 100644
--- a/libavfilter/vf_fps.c
+++ b/libavfilter/vf_fps.c
@@ -103,7 +103,7 @@ static av_cold void uninit(AVFilterContext *ctx)
 {
     FPSContext *s = ctx->priv;
     if (s->fifo) {
-        s->drop += av_fifo_size(s->fifo) / sizeof(AVFilterBufferRef*);
+        s->drop += av_fifo_size(s->fifo) / sizeof(AVFrame*);
         flush_fifo(s->fifo);
         av_fifo_free(s->fifo);
     }