diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c
index 826dafbd00..d9083ad984 100644
--- a/libavdevice/lavfi.c
+++ b/libavdevice/lavfi.c
@@ -150,7 +150,7 @@ av_cold static int lavfi_read_header(AVFormatContext *avctx)
         if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
             goto end;
         ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
-        av_dict_set(&options, "protocol_whitelist", NULL, 0);
+        av_dict_free(&options);
         if (ret < 0)
             goto end;
         av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);